pH of buffer solution : 4.32
Further explanationA buffer solution is a solution that can maintain a good pH value due to the addition of a little acid or a little base or dilution.
The buffer solution can be acidic or basic
Acid buffer solutions consist of weak acids(H₂CO₃) and their salts.(NaHCO₃)
mol H₂CO₃
[tex]\tt 0.032\times 0.25=0.008[/tex]
mol NaHCO₃
[tex]\tt 0.02\times 0.15=0.003[/tex]
[tex]\tt [H^+]=Ka\dfrac{mole~weak~acid}{mole~salt}\\\\(H^+]=1.8\times 10^{-5}\dfrac{0.008}{0.003}=4.8\times 10^{-5}\\\\pH=5-log~4.8=4.32[/tex]
What is the name of the region (on the graph) where the temperature remains constant while heat is being absorbed (or released)?
Answer:
A heating curve graphically represents the phase transitions that a substance undergoes as heat is added to it. The plateaus on the curve mark the phase changes. The temperature remains constant during these phase transitions.
According to the following reaction, how many grams of sulfur are formed when 37.4 g of water are formed?
2H₂S(g) + SO₂(g) → 3S(s) + 2H₂O(l)
Answer:
Mass = 100.8 g
Explanation:
Given data:
Mass of sulfur formed = ?
Mass of water formed = 37.4 g
Solution:
Chemical equation:
2H₂S + SO₂ → 3S + 2H₂O
Number of moles of water:
Number of moles = mass/molar mass
Number of moles = 37.4 g/ 18 g/mol
Number of moles = 2.1 mol
Now we will compare the moles of water and sulfur.
H₂O : S
2 : 3
2.1 : 3/2×2.1 = 3.15
Mass of sulfur:
Mass = number of moles × molar mass
Mass = 3.15 mol × 32 g/mol
Mass = 100.8 g
Chlorophyll is found in
A. neither plant
nor animal cells.
B. animal cells.
C. plant cells.
D. plant and animal cells.
Answer:
Only plant cells
Explanation:
This organelle helps plants photosynthesize. Humans do not do that.
Ice, H2O(s), is classified as: An ionic compound, a molecular compound, a homogeneous mixture, a heterogeneous mixture
Answer:
A molecular compound.
Explanation:
An ionic compound is composed of both metal and non-metal elements. Oxygen and hydrogen are both non-metal elements.Any mixture (no matter if it is homogeneous or heterogeneous) is composed of two or more compounds.Ice is simply water in solid form, so it is only one compound. Hence the answer is A molecular compound.Ice, H2O(s), is classified as ; ( B ) A molecular compound
Given that Ice and H₂O are the same element but in different forms therefore we can classify Ice, H₂O as been a molecular compound.
Ice and H₂O are not ionic compounds because ionic compounds are formed between metal and non-metal elements while H₂O and Ice are neither metals but are both Nonmetals
Hence we can conclude that Ice, H2O(s), is classified as A molecular compound
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A buffer solution is made that is 0.347 M in H2C2O4 and 0.347 M KHC2O4.
1. If Ka for H2C2O4 is 5.90E^-2, what is the pH of the buffer solution?
b. Write the net ionic equation for the reaction that occurs when 0.070 mol KOH is added to 1.00 L of the buffer solution.
Answer:
1. pH = 1.23.
2. [tex]H_2C_2O_4(aq) +OH^-(aq)\rightarrow HC_2O_4^-(aq)+H_2O(l)[/tex]
Explanation:
Hello!
1. In this case, for the ionization of H2C2O4, we can write:
[tex]H_2C_2O_4\rightleftharpoons HC_2O_4^-+H^+[/tex]
It means, that if it is forming a buffer solution with its conjugate base in the form of KHC2O4, we can compute the pH based on the Henderson-Hasselbach equation:
[tex]pH=pKa+log(\frac{[base]}{[acid]} )[/tex]
Whereas the pKa is:
[tex]pKa=-log(Ka)=-log(5.90x10^{-2})=1.23[/tex]
The concentration of the base is 0.347 M and the concentration of the acid is 0.347 M as well, as seen on the statement; thus, the pH is:
[tex]pH=1.23+log(\frac{0.347M}{0.347M} )\\\\pH=1.23+0\\\\pH=1.23[/tex]
2. Now, since the addition of KOH directly consumes 0.070 moles of acid, we can compute the remaining moles as follows:
[tex]n_{acid}=0.347mol/L*1.00L=0.347mol\\\\n_{acid}^{remaining}=0.347mol-0.070mol=0.277mol[/tex]
It means that the acid remains in excess yet more base is yielded due to the effect of the OH ions provided by the KOH; therefore, the undergone chemical reaction is:
[tex]H_2C_2O_4(aq) +OH^-(aq)\rightarrow HC_2O_4^-(aq)+H_2O(l)[/tex]
Which is also shown in net ionic notation.
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In the image below if the frisbee represents lights, what does the fence represent?
Answer:
The atmosphere
Explanation:
It reflects and traps the light outside of the Earth's Atmosphere?
I think, hope i helped.
how do you determine number of valence electrons an element has
Answer:the first column has one valance electron the second has 2 and so on.
The only exception is helium that has 2.
Explanation:
What is the name of the groups that contain Iron(Fe) and Gold(Au)?
Answer:
Transition Metals
Explanation:
Answer:
Group 8 & 11
Explanation:
Transition Metals
What elements in group 17 are solids liquids and gass?
Answer: \(\left( \ce{F} \right)\), chlorine \(\left( \ce{Cl} \right)\), bromine \(\left( \ce{Cl} \right)\), iodine \(\left( \ce{I} \right)\), and astatine \(\left( \ce{At} \right)\)
Explanation:
can someone put this in other words Conduct an investigation to explore the use of Punnett squares to predict genotypes and phenotypes of offspring.
What type of temperatures and moisture content does Marine time Tropical air have?
Group of answer choices
Cold Temps/ Moist Air
Warm Temps/ Dry Air
Cold Temps/ Dry Air
Warm Temps/ Moist Air
Answer:
D: Warm Temps/ Moist Air
Explanation:
Tropical places usulay have warm mosit air
Maritime Tropical air is associated with warm temperatures and moist air.
Maritime Tropical (mT) air is a type of air mass that forms over warm tropical or subtropical ocean regions. It acquires its characteristics from the ocean's influence, particularly its warm temperatures and high moisture content.
Warm Temperatures: Maritime Tropical air masses originate from regions near the equator or subtropics, where solar radiation is intense and consistently high. As a result, these air masses are typically warm, with temperatures ranging from mild to hot.
The term "Maritime" refers to air masses that have originated from over the ocean, which generally have higher moisture content due to evaporation from the ocean surface. The term "Tropical" indicates that the air mass originates from or near tropical regions, where warm temperatures are prevalent.
Therefore, the correct answer is: Warm Temps/ Moist Air.
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Explain how the pH of water has a synergistic relationship with other substances.
Provide an example.
Answer:
Explanation:
he pH of the water will determine the toxic effects, if any, of these substances.
Pure water is neutral with the pH of 7. But when water combines with other substance the pH varies as per the acidity of the combining substance.
What is pH?pH is the measure of acidity of a solution and mathematically it is the negative logarithm of hydrogen ion concentration. Acidic substance have a pH of less than 7 whereas, basic substance have higher pH value.
Water when combines with some acids, its acidity increases. For example acid rain resulting from the reaction of rain water with oxides of nitrogen and Sulphur forming nitric acid and sulphuric acid.
pH of water have a role in the toxic effects of components in water pH and alkalinity of water determines the coagulation of other substances in water.
Hence, the properties of other substance in water is pH dependent and might effect the alkalinity or acidity of water as well the properties of substances in water such as toxicity.
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What can element automatic number tell you about its state of matter
Answer:
Identifies the number of protons a single atom of the element contains.
Explanation:
The atomic number helps people identify elements according to the number of protons one atom of the element has. It essentially defines the element.
While having a neutral charge, it also provides the number of electrons the element has (in one atom).
Which of the following statement best defines matter?
How many moles of CO are produced when 1.8 moles C reacts?
Express your answer using two significat figures.
5C(s) + 2SO2(g) => CS2(l) +4CO(g)
Answer:
1.44mole of CO
Explanation:
The reaction equation is given as:
5C + 2SO₂ → CS₂ + 4CO
We check to see if the expression is balanced and it is so;
Now;
Given;
1.8mole of C reacted; how many moles of CO are produced;
From the balanced reaction equation:
5 mole of C is expected to produce 4 mole of CO
1.8 mole of C will then produce [tex]\frac{4 x 1.8}{5}[/tex] = 1.44mole of CO
If 15.5 mL of 0.225 M aqueous magnesium chloride is added to 37.5 mL of 0.250 M aqueous lead(II) nitrate, then what mass of lead(II) chloride precipitates?A. 0.485 g.B. 0.971 g.C. 1.94 g.D. 3.888 g.E. 5.82 8 g.
Answer:
B. 0.971 g
Explanation:
When MgCl₂(aq) reacts with Pb(NO₃)₂(aq), PbCl₂(s) and Mg(NO₃)₂(aq) are produced:
MgCl₂(aq) + Pb(NO₃)₂(aq) →, PbCl₂(s) + Mg(NO₃)₂(aq)
Thus, we need to find imiting reactant finding moles of each reactant:
Moles MgCl₂:
15.5mL = 0.0155L * (0.225 mol / L) = 3.49x10⁻³ moles
Moles Pb(NO₃)₂:
37.5mL = 0.0375L * (0.250mol / L) = 9.38x10⁻³ moles
As the ratio of the reactants is 1:1, the moles of PbCl₂ are 3.48x10⁻³ moles.
We need to convert thes moles to mass using molar mass of PbCl₂ (278.1g/mol), thus:
3.48x10⁻³ moles * (278.1g/mol) =
0.968g of PbCl₂ are precipitate
Thus, right answer is:
B. 0.971 gIn which orbitals would the valence electrons for selenium (Se) be placed?
Answer:
Valence electrons of selenium will be placed in s and p-orbitals.
Explanation:
Hope this helps.
an ionic bond forms when atoms blank electrons
Answer:
An ionic bond forms when atoms transfer electrons.
Explanation:
Ionic bonds are formed when atoms transfer electrons. (In contrast, covalent bonds are formed when atoms share electrons.)
There's a distinction between the two: when two atoms react to form an ionic bond, one atom would completely lose one electron, while the other would completely gain that electron. The atom that loses the electron becomes a positively-charged ion called a cation, whereas the atom that gains the electron becomes a negatively-charged ion called an anion.
For example, consider the reaction between a sodium [tex]\rm Na[/tex] atom and a chlorine [tex]\rm Cl[/tex] atom: [tex]\rm Na + Cl \to NaCl[/tex].
When the sodium atom and the chlorine atom encounter, the sodium atom would lose one electron to form a positively-charged sodium ion, [tex]\rm Na^{+}[/tex]. The chlorine atom would gain that electron to form a negatively-charged chlorine ion [tex]\rm Cl^{-}[/tex].
These two ions will readily attract each other because of the opposite electrostatic charges on them. This electrostatic attraction (between two ions of opposite charges) is an ionic bond.
Overall, it would appear as if the sodium [tex]\rm Na[/tex] atom transferred an electron to the chlorine [tex]\rm Cl[/tex] atom to form an ionic bond.
In contrast, when two atoms react to form a covalent bond, they share electrons without giving any away completely. Therefore, it is possible to break certain covalent bonds apart (using a beam of laser, for example) and obtain neutral atoms.
On the other hand, when an ionic bond was broken, the result would be two charged ions- not necessarily two neutral atoms. The electron transfer could not be reversed by simply breaking the bond.
For example, when table salt [tex]\rm NaCl[/tex] is melted (at a very high temperature,) the ionic bond between the sodium ions and chloride ions would (mostly) be broken. However, doing so would only generate a mixture of [tex]\rm Na^{+}[/tex] and [tex]\rm Cl^{-}[/tex] ions- not sodium and chlorine atoms.
Answer:yea it’s transfer
Explanation:
Aluminum metal reacts with hydrochloric acid according to the following equation:
2 A l left parenthesis s right parenthesis plus 6 H C l left parenthesis a q right parenthesis rightwards arrow 2 A l C l subscript 3 left parenthesis a q right parenthesis plus 3 H subscript 2 left parenthesis g right parenthesis
If 28.1 grams of aluminum reacts with 46 mL of a 1 M HCl solution, how many grams of AlCl3 will be generated? Hint: You must determine the limiting reactant
Answer:
18 g
Explanation:
Step 1: Write the balanced equation
2 Al + 6 HCl ⇒ 2 AlCl₃ + 3 H₂
Step 2: Calculate the moles of Al
The molar mass of Al is 26.98 g/mol.
28.1 g × 1 mol/26.98 g = 1.04 mol
Step 3: Calculate the moles of HCl
46 mL of 1 M HCl react.
0.046 L × 1 mol/L = 0.046 mol
Step 4: Determine the limiting reactant
The theoretical molar ratio of Al to HCl is 2:6 = 0.33:1.
The real molar ratio of Al to HCl is 1.04:0.046 = 22.6:1
According to this, the limiting reactant is HCl.
Step 5: Calculate the mass of AlCl₃ generated from 0.046 moles of HCl
The molar ratio of HCl to AlCl₃ is 6:2. The molar mass of AlCl₃ is 133.34 g/mol.
0.046 mol HCl × 6 mol HCl/2 mol AlCl₃ × 133.34 g AlCl₃/1 mol AlCl₃ = 18 g AlCl₃
amu.
An atom with 4 protons, 5 neutrons, and 4 electrons has an atomic mass of
(Enter a whole number.)
Answer:
Explanation:
the sum of number of proton and neutron is known as atomic mass
so if number of proton is 4 and neutron is 5 then atomic mass of an atom is 9
Read the information about the halogen family.
Elements within a group share similar properties. Elements in the halogen family, such as fluorine (F), chlorine (Cl), bromine (Br), and iodine (I), all have seven valence electrons. Iodine is an important element for human health. The thyroid gland uses iodine to produce hormones. One of the hormones it makes is a covalent compound called thyroxine.
Given this information, what effect do you think other halogen elements have on human health? State your prediction, and do some research on one of the halogen elements to see how it affects human health. List your findings, and then give your opinion on whether you think the element you chose should be used in food products, cleaning products, or in other manners that cause it to come in contact with humans. Be sure to provide evidence from your research to support your opinion.
Answer:
See explanation
Explanation:
Chlorine is a member of the halogen family known as a toxic yellowish green gas. Inhalation of chlorine for a prolonged period of time leads to pulmonary edema. If a person comes in contact with compressed liquid chlorine the person may experience frostbite of the skin and eyes.
However chlorine is very useful in water disinfection and is preferred in water treatment because it provides residual disinfection of the treated water.
Chlorine gas may be dissolved in NaOH to form oxochlorate I which is used as a bleach in cleaning.
Answer:
Iodine
Explanation:
iodine is pretty good for you in moderation, iodine can ensure proper tyriod function but too much of it can cause thyroid gland inflammation and thyroid cancer, burning of the mouth, throat, and stomach; and coma.
Which of the following statement best defines matter?
Answer:matter is anything has mass and take up space
Explanation:
A solution is known to contain either Ni2 or Cr3 . Addition of what single (1 only) reagent would identify which ion is present?
Answer:
Explanation:
From the periodic table; both elements given are from the same group 3.
To test for which ion will be present in the experiment;
We added 6M aqueous sodium hydroxide in excess.
This process is followed by the addition of hydrogen peroxide H2O2 while stirring.
Heat is then applied to the solution.
After we've carried out those process;
We will notice the following;
If[tex]Ni^{2+}[/tex] is present, then a green [tex]NI(OH)_2[/tex] precipitate will be formed
If [tex]Cr^{3+}[/tex] is present,then a yellow-colored [tex]CrO^{2-}_{4}[/tex] will be formed.
The mass of 900. atoms of sodium(Na)
Answer:
3.44 × 10⁻²⁰ g Na
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
900 atoms Na
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of Na - 22.99 g/mol
Step 3: Convert
[tex]900 \ atoms \ Na(\frac{1 \ mol \ Na}{6.022 \cdot 10^{23} \ atoms \ Na} )(\frac{22.99 \ g \ Na}{1 \ mol \ Na} )[/tex] = 3.4359 × 10⁻²⁰ g Na
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
3.4359 × 10⁻²⁰ g Na ≈ 3.44 × 10⁻²⁰ g Na
explain what happens to temperature and energy as molecules move from gas to liquid to solid
Answer and Explanation:
As the temperature of the substances increases, the average energy of the molecules increases, and average energy of attraction between the molecules decreases consequently intermolecular spacing between the molecules increases. As a result, a substance change in succession from gas to liquid to solid.
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Answer: C
Explanation: Everything else is true.
a box has dimensions 0.2 m x 0.4m x 0.6m. what is the volume of the box in cubic meters?
Answer: 0.048 cubic meters
Explanation:
Volume of a rectangular solid is lxwxh. So you multiply the given dimensions.
What is the work function of gold metal in kJ/mol if light with λ = 234 nm is necessary to eject electrons?
Answer
512kj/mole
Explanation:
What is the work function of gold metal in kJ/mol if light with λ = 234 nm is necessary to eject electrons?
The energy can be calculated using below expresion;
E = hc/λ
Where h= planks constant= 6.626 x 10^-34
c= speed of light= 3 x 10^
λ= wavelength
hc= (6.626 x 10^-34 x 3 x 10^ 8)
=
what is the equation for the esterification of glycerol and three palmitic acid
Answer:
Pentyl Ethanoate, CH3COOC5H11, which smells like bananas, is produced from the esterification reaction: CH3COOH(aq) +C5H11OH(aq) → CH3COOC5H11(aq) + H … 2O(l) A reaction uses 3.58g of CH3COOH and 4.75g of C5H11OH and has a yield of 45.00%. Determine the mass of ester that foorms
The bond lengths of the X-H bonds in CH4, SiH4, and SnH4 are 1.09, 1.48, and 1.71 Å, respectively. Estimate the length of the Ge-H bond in GeH4. Which of these four hydrides has the weakest X-H bond?Estimated Ge-H bond length =________________ ÅWeakest X-H bond in ________________
Answer:
what
Explanation:what