Homework Answers
![H2O H+ + OH- [H+] = 1 x 10-7 mol/L i PH = -log [H+] = -log (104) = -(-7) log 10 = 7 - PH=7 = [OHO 7 = 1 x 10 moll 8. POH = -l](http://img.homeworklib.com/questions/b9693310-4986-11ea-a9f8-8f9e84608888.png?x-oss-process=image/resize,w_560)
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3. Water will spontaneously break apart as follows: H20 - H + OH This does not...
E. 59) The pH of a solution ranges from 0 to 14. An acid has a pH less than 7. Pure water is neut...
e. 59) The pH of a solution ranges from 0 to 14. An acid has a pH less than 7. Pure water is neutral and has a pH of 7. The pH of a solution is given by pH--log (x)where x represents the concentration of the hydrogen ions in the solution in moles per liter. Find the pH if the hydrogen ion concentration is 3 x 10-3, A) 3.52 B) 2.48 C) 2.52 D) 3.48
e. 59) The pH of...
calculate the molar solubility of Cr(OH)3 in a solution with a pH of 11.5 knowing that...
calculate the molar solubility of Cr(OH)3 in a
solution with a pH of 11.5 knowing that Ksp(Cr(OH)3) = 6.7 x
10^(-31)
1. Calculate the molar solubility of Cr(OH), in a solution with a pH of 11.5 knowing that Kop(Cr(OH)2) = 6.7 x 10" 2. What is the pH of a 0.895M sodium fluoride (NaF) solution knowing that the hydrofluoric acid is 7.11 x 10 of 3. Calculate the molar solubility of antimony sulfide (Sb2S) in water knowing K =1.6 x...
Model I: The Dissolution of Magnesium Hydroxide in Water When solid Mg(OH)2 dissolves in water, the...
Model I: The Dissolution of Magnesium Hydroxide in Water When solid Mg(OH)2 dissolves in water, the chemical reaction is: Mg(OH)2(s) Mg2+(aq) + 2OH-(aq) (1) Table I. These are the results after equilibrium has been established for the addition of solid Mg(OH)2(s) to water yielding a final volume of 10.0 L of solution. Total amount of Mg(OH)2 added Mg2+ concentration in the resulting solution at eq OH- concentration in the resulting solution at eq Mass of Mg(OH)2 that does not dissolve...
please help 7. (18 points) Consider the reaction: Nia (aq) +H.000) = OH(aq) + HNla(aq) K...
please help
7. (18 points) Consider the reaction: Nia (aq) +H.000) = OH(aq) + HNla(aq) K = 6.25x101 @25°C SHOW ALL WORK Note: HNia weak acid Niacin (COHON, one of the B vitamins) AG = A. (6 points) What is AG"(KI) for this reaction ſhow your work. --RTink B. (12 points) What are the equilibrium concentrations (M) of each species in a solution that was prepared by mixing 0.157 moles of HNia and 0.315 moles of Nia- in a 1.000...
QUESTION 6 The body uses urea, H2NCONH2, to conduct waste nitrogen from protein decomposition out of...
QUESTION 6 The body uses urea, H2NCONH2, to conduct waste nitrogen from protein decomposition out of the body.Calculate the molar mass of urea and determine the number of moles of nitrogen there are in 12.6 g of urea. The molar masses of the elements are as follows: N = 14.01, C = 12.01, O = 16.00, and H = 1.008 (all g/mol) a. 0.42 mol N b. 0.21 mol N c. 0.54 mol N d. 0.47 mol N e. None...
8-10 8. Determine the reduction potential for H2O(l) in neutral water: [H"]= [OH = 10? (6...
8-10
8. Determine the reduction potential for H2O(l) in neutral water: [H"]= [OH = 10? (6 points) (P. = 1 atm) 9. A cobalt electrode is placed in 1.00 L of I M CO(NO3)2(aq) and a chromium electrode is placed in 1.00 L of IM Cr(NO3)3(aq). Electrodes are connected by a wire through a voltmeter and the solutions are connected by a salt bridge. (16 points) a. The reduction reaction will be: b. The oxidation reaction will be: c. The...
6. Given a total dissolved lead concentration of 2.0x10-5 M, a total dissolved NTA concentration of...
6. Given a total dissolved lead concentration of
2.0x10-5 M, a total dissolved NTA concentration of
2.0x10-2 M, and a pH of 12.3 (note extreme pH)
a. Under these conditions, what is the dominant form of NTA?
b. Write an equation for total dissolved NTA and for total
dissolved Pb. What assumptions can you make?
c. Calculate the predicted [Pb2+], considering NTA
complexation only?
d. What is the [Pb2+] as predicted by the solubility
of Pb(OH)2(s) at pH 12.3?
e....
7. A low concentration of NTA has equilibrated with PbCO3(s) at pH 7.00 in a medium...
7. A low concentration of NTA has equilibrated with
PbCO3(s) at pH 7.00 in a medium having a final
HCO3- concentration of 7.50x10-4
M.
a. Determine [Pb2+].
b. Write out KT and the overall reaction for
KT.
c. What is the ratio of [Pb(NTA)- ] to
[H(NTA)2-] in this solution?
Potentially useful data: Reaction Hg 2 +2e = Hgº(s) Feste = Fe2 Cu 2 +2e = Cuº(s) 2H + 2e = H2(g) Pb2 +2e=Pbº(s) Ca*2 + 2e = Cdº(s) 1/4...
A buffer solution is able to maintain a constant pH when small amounts of acid or...
A buffer solution is able to maintain a constant pH when small amounts of acid or base are added to the buffer. Consider what happens when 1 mL of a 5 M solution is added or 0.005 mol of HCl are added to a 100.0 mL solution acetic acid buffer that contains 0.0100 mol of Acetic acid, HC,H,O,, and 0.0100 mol of sodium acetate, NaC,H,O,. The initial concentration of both the acid and the base are 0.0100 mol/ 0.1000 L...
complete the stoichiometry table for the process above Experimental Notes 4, H ОН NaBH4 NaOH OH...
complete the stoichiometry table for the process above
Experimental Notes 4, H ОН NaBH4 NaOH OH H2O OH Step 1: Procedure for the Sodium Borohydride Reduction of 3-Ethoxy-4-hydroxybenzaldehyde: Dissolve 1.62 g of 3-ethoxy-4-hydroxybenzaldehyde in 10 mL of 1.0 M NaOH in a 125 mL Erlenmeyer flask with a magnetic stir bar. Cool the flask in a cold-water bath, and then add, in small portions, 0.30 g of NaBH, over five minutes. Remove the cold-water bath and allow the reaction flask...
e. 59) The pH of a solution ranges from 0 to 14. An acid has a pH less than 7. Pure water is neutral and has a pH of 7. The pH of a solution is given by pH--log (x)where x represents the concentration of the hydrogen ions in the solution in moles per liter. Find the pH if the hydrogen ion concentration is 3 x 10-3, A) 3.52 B) 2.48 C) 2.52 D) 3.48
e. 59) The pH of...
calculate the molar solubility of Cr(OH)3 in a
solution with a pH of 11.5 knowing that Ksp(Cr(OH)3) = 6.7 x
10^(-31)
1. Calculate the molar solubility of Cr(OH), in a solution with a pH of 11.5 knowing that Kop(Cr(OH)2) = 6.7 x 10" 2. What is the pH of a 0.895M sodium fluoride (NaF) solution knowing that the hydrofluoric acid is 7.11 x 10 of 3. Calculate the molar solubility of antimony sulfide (Sb2S) in water knowing K =1.6 x...
please help
7. (18 points) Consider the reaction: Nia (aq) +H.000) = OH(aq) + HNla(aq) K = 6.25x101 @25°C SHOW ALL WORK Note: HNia weak acid Niacin (COHON, one of the B vitamins) AG = A. (6 points) What is AG"(KI) for this reaction ſhow your work. --RTink B. (12 points) What are the equilibrium concentrations (M) of each species in a solution that was prepared by mixing 0.157 moles of HNia and 0.315 moles of Nia- in a 1.000...
8-10
8. Determine the reduction potential for H2O(l) in neutral water: [H"]= [OH = 10? (6 points) (P. = 1 atm) 9. A cobalt electrode is placed in 1.00 L of I M CO(NO3)2(aq) and a chromium electrode is placed in 1.00 L of IM Cr(NO3)3(aq). Electrodes are connected by a wire through a voltmeter and the solutions are connected by a salt bridge. (16 points) a. The reduction reaction will be: b. The oxidation reaction will be: c. The...
6. Given a total dissolved lead concentration of
2.0x10-5 M, a total dissolved NTA concentration of
2.0x10-2 M, and a pH of 12.3 (note extreme pH)
a. Under these conditions, what is the dominant form of NTA?
b. Write an equation for total dissolved NTA and for total
dissolved Pb. What assumptions can you make?
c. Calculate the predicted [Pb2+], considering NTA
complexation only?
d. What is the [Pb2+] as predicted by the solubility
of Pb(OH)2(s) at pH 12.3?
e....
7. A low concentration of NTA has equilibrated with
PbCO3(s) at pH 7.00 in a medium having a final
HCO3- concentration of 7.50x10-4
M.
a. Determine [Pb2+].
b. Write out KT and the overall reaction for
KT.
c. What is the ratio of [Pb(NTA)- ] to
[H(NTA)2-] in this solution?
Potentially useful data: Reaction Hg 2 +2e = Hgº(s) Feste = Fe2 Cu 2 +2e = Cuº(s) 2H + 2e = H2(g) Pb2 +2e=Pbº(s) Ca*2 + 2e = Cdº(s) 1/4...
A buffer solution is able to maintain a constant pH when small amounts of acid or base are added to the buffer. Consider what happens when 1 mL of a 5 M solution is added or 0.005 mol of HCl are added to a 100.0 mL solution acetic acid buffer that contains 0.0100 mol of Acetic acid, HC,H,O,, and 0.0100 mol of sodium acetate, NaC,H,O,. The initial concentration of both the acid and the base are 0.0100 mol/ 0.1000 L...
complete the stoichiometry table for the process above
Experimental Notes 4, H ОН NaBH4 NaOH OH H2O OH Step 1: Procedure for the Sodium Borohydride Reduction of 3-Ethoxy-4-hydroxybenzaldehyde: Dissolve 1.62 g of 3-ethoxy-4-hydroxybenzaldehyde in 10 mL of 1.0 M NaOH in a 125 mL Erlenmeyer flask with a magnetic stir bar. Cool the flask in a cold-water bath, and then add, in small portions, 0.30 g of NaBH, over five minutes. Remove the cold-water bath and allow the reaction flask...
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