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1. Multiple choice: Each question is worth 4 points (some useful equation are on last page)...
PART 1: Circle the best choice(s) on the test paper directly. Each multiple-choice question is worth...
PART 1: Circle the best choice(s) on the test paper directly. Each multiple-choice question is worth 4 points 1. Calculate a when 33.6 g of water is heated from 22.0°C to 78.3°C. 0.991 kJ А. B C. 1.89 kJ 7.91 kJ -7.91 kJ D. 2. Determine the number of moles of this compound: 0.125 kg of the insecticide Paris Green, Cul(AsO3)2(CH3CO2)2 A. 4.94 B. 3.49 C. 0.287 D. 0.202 E. 0.2866 3. What is the net ionic equation for the...
16) Write a balanced net ionic equation for the reaction of H2SO4iag) with Ba(OH)2(g) A) Ba2+(ag)...
16) Write a balanced net ionic equation for the reaction of H2SO4iag) with Ba(OH)2(g) A) Ba2+(ag) + SO42-(a)- BaSO4) B) 2 H+(aq) SO42-(a) Ba2 (ag) +2 OH-(a)-BaSO4(0 2 H20) C) H2SO4(a) + Ba(OH)2(e) - BaSO40) 2 H20() D) H (ag) OH(ag)--H2O) 16) 17) Write a balanced net ionic equation for the reaction of Pb(NO3)2(ag) with Nal(ag). A) Pb2 (ag)+2 NO3-(4g) +2 Na+ (ag) +2 1-(a4)-- Pb2+(ag)+ 2 1-(a4)+ 2 Na (a) +2 NO3-(a) B) Pb2+(ag) 2 NO3-(a) + 2 Na...
10. For an aqueous solution labeled "0.10 M potassium bromide," A) the pH is greater than...
10. For an aqueous solution labeled "0.10 M potassium bromide," A) the pH is greater than 7. B) the pH = 13. D) the pH is less than 7. E) the pH = 7. C) the pH = 1. 11. For a 0.10 M solution of a weak acid, HA, with pKa = 6, which of the following is true? A) [HA] =[A-] B) [HA] does not equal [H3O+] C) [HA] =[H3O] D) [HA] = K E) [HA] = 0...
9) Which one of the following pairs cannot be mixed together to form a buffer solutions...
9) Which one of the following pairs cannot be mixed together to form a buffer solutions A) KOH, HNO2 B) H2S03. KHSO3 C) HONH2, HONH3CI D) NaCI, HCI E) RbOH, HF 10) The Henderson-Hasselbalch equation is acid) acid] A) pH- pKa log basel base] D) pH - pKaobase [acid 11) HA is a weak acid. Which equilibrium corresponds to the equilibrium constant Kp for A- A) A (aq) H30+ (aq) HA (aq) H20 0) B) HA (aq) + OH-(aq) 근...
Question 21 8 pts A solution has a OH-concentration [OH-] = 2.5 x 10-4 M. a....
Question 21 8 pts A solution has a OH-concentration [OH-] = 2.5 x 10-4 M. a. Calculate the hydronium ion [H3O+] concentration in molarity. (Show all your work !!!!!) b. Calculate the pH and tell whether the solution is acidic or basic. (Show all your work !!!!!) 12pt v Paragraph v BI U A Av Tev : Question 20 6 pts Given the following chemical reaction, determine how many moles of HNO3 are reacted to make 22.7 g of H20....
help me out, please! answer all the multiple choice. (15) A phosphate buffer solution is prepared by mixing 100. m...
help me out, please! answer all the multiple
choice.
(15) A phosphate buffer solution is prepared by mixing 100. mL. of 0.300 M KH PO, and 150.ml 0.500 M K HPO (a) Calculate the molar concentrations of H:PO, and that of HPO,2 in the buffer solution. (b) What is the pH of the buffer solution? (H,PO, has K,-6.2 x 10 (c) Write a net ionic equation for the bufering reaction against a strong acid, Hjo (d) Calculate the new concentration...
Circle one best answer for each multiple. (4 pt. each) 1. The pH of 2.OM HCl...
Circle one best answer for each multiple. (4 pt. each) 1. The pH of 2.OM HCl is a) 2.0, b) 1.0, c) 0.0, d) <0.0. 2. Thymol blue appears red below pH 1.0, yellow between PH 2.5 - 8.0, and blue above pH 9.5. An aqueous solution turns green upon adding one drop of thymol blue. The pH of this solution is a) 0.5, b) 7, c) 9, d) 11. 3. The buffer HF/F can be prepared by mixing a)...
8. Using the Nernst equation, determine the ratio of Hg2+ to Cu2+ at equilibrium in an electrochemical cell in otherwise...
8. Using the Nernst equation, determine the ratio of
Hg2+ to Cu2+ at equilibrium in an
electrochemical cell in otherwise pure water, when in contact with
Hg(s) and Cu (s)
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 O2(g) + H + = 1/2 H2O 2 02(g) + 2H+ + 2e = H,O2 1/2 NO3 + H +...
1) The net ionic equation for the reaction between aqueous nitric acid and aqueous sodium hydroxide...
1) The net ionic equation for the reaction between aqueous nitric acid and aqueous sodium hydroxide is A) H+ (aq) + HNO3 (aq) + 2OH- (aq) → 2H20 (1) + NO3- (aq) B) HNO3 (aq) + NaOH(aq) → NaNO3(aq) + H20 (1) C) H+ (aq) + OH- (aq) + H2O (1) D) HNO3 (aq) + OH- (aq) + NO3- (aq) + H2O (1) E) H+ (aq) + Na+ (aq) + OH- (aq) → H20 (1) + Na+ (aq) 2) Which...
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....
PART 1: Circle the best choice(s) on the test paper directly. Each multiple-choice question is worth 4 points 1. Calculate a when 33.6 g of water is heated from 22.0°C to 78.3°C. 0.991 kJ А. B C. 1.89 kJ 7.91 kJ -7.91 kJ D. 2. Determine the number of moles of this compound: 0.125 kg of the insecticide Paris Green, Cul(AsO3)2(CH3CO2)2 A. 4.94 B. 3.49 C. 0.287 D. 0.202 E. 0.2866 3. What is the net ionic equation for the...
16) Write a balanced net ionic equation for the reaction of H2SO4iag) with Ba(OH)2(g) A) Ba2+(ag) + SO42-(a)- BaSO4) B) 2 H+(aq) SO42-(a) Ba2 (ag) +2 OH-(a)-BaSO4(0 2 H20) C) H2SO4(a) + Ba(OH)2(e) - BaSO40) 2 H20() D) H (ag) OH(ag)--H2O) 16) 17) Write a balanced net ionic equation for the reaction of Pb(NO3)2(ag) with Nal(ag). A) Pb2 (ag)+2 NO3-(4g) +2 Na+ (ag) +2 1-(a4)-- Pb2+(ag)+ 2 1-(a4)+ 2 Na (a) +2 NO3-(a) B) Pb2+(ag) 2 NO3-(a) + 2 Na...
10. For an aqueous solution labeled "0.10 M potassium bromide," A) the pH is greater than 7. B) the pH = 13. D) the pH is less than 7. E) the pH = 7. C) the pH = 1. 11. For a 0.10 M solution of a weak acid, HA, with pKa = 6, which of the following is true? A) [HA] =[A-] B) [HA] does not equal [H3O+] C) [HA] =[H3O] D) [HA] = K E) [HA] = 0...
9) Which one of the following pairs cannot be mixed together to form a buffer solutions A) KOH, HNO2 B) H2S03. KHSO3 C) HONH2, HONH3CI D) NaCI, HCI E) RbOH, HF 10) The Henderson-Hasselbalch equation is acid) acid] A) pH- pKa log basel base] D) pH - pKaobase [acid 11) HA is a weak acid. Which equilibrium corresponds to the equilibrium constant Kp for A- A) A (aq) H30+ (aq) HA (aq) H20 0) B) HA (aq) + OH-(aq) 근...
Question 21 8 pts A solution has a OH-concentration [OH-] = 2.5 x 10-4 M. a. Calculate the hydronium ion [H3O+] concentration in molarity. (Show all your work !!!!!) b. Calculate the pH and tell whether the solution is acidic or basic. (Show all your work !!!!!) 12pt v Paragraph v BI U A Av Tev : Question 20 6 pts Given the following chemical reaction, determine how many moles of HNO3 are reacted to make 22.7 g of H20....
help me out, please! answer all the multiple
choice.
(15) A phosphate buffer solution is prepared by mixing 100. mL. of 0.300 M KH PO, and 150.ml 0.500 M K HPO (a) Calculate the molar concentrations of H:PO, and that of HPO,2 in the buffer solution. (b) What is the pH of the buffer solution? (H,PO, has K,-6.2 x 10 (c) Write a net ionic equation for the bufering reaction against a strong acid, Hjo (d) Calculate the new concentration...
Circle one best answer for each multiple. (4 pt. each) 1. The pH of 2.OM HCl is a) 2.0, b) 1.0, c) 0.0, d) <0.0. 2. Thymol blue appears red below pH 1.0, yellow between PH 2.5 - 8.0, and blue above pH 9.5. An aqueous solution turns green upon adding one drop of thymol blue. The pH of this solution is a) 0.5, b) 7, c) 9, d) 11. 3. The buffer HF/F can be prepared by mixing a)...
8. Using the Nernst equation, determine the ratio of
Hg2+ to Cu2+ at equilibrium in an
electrochemical cell in otherwise pure water, when in contact with
Hg(s) and Cu (s)
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 O2(g) + H + = 1/2 H2O 2 02(g) + 2H+ + 2e = H,O2 1/2 NO3 + H +...
1) The net ionic equation for the reaction between aqueous nitric acid and aqueous sodium hydroxide is A) H+ (aq) + HNO3 (aq) + 2OH- (aq) → 2H20 (1) + NO3- (aq) B) HNO3 (aq) + NaOH(aq) → NaNO3(aq) + H20 (1) C) H+ (aq) + OH- (aq) + H2O (1) D) HNO3 (aq) + OH- (aq) + NO3- (aq) + H2O (1) E) H+ (aq) + Na+ (aq) + OH- (aq) → H20 (1) + Na+ (aq) 2) Which...
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....
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