1
answer
0
watching
175
views
16 Nov 2019
Which of the following solution can function as a buffer? a. a solution containing HCL and NaCI b. a solution containing NaOH and NaCl c. a solution containing HC_2 H_3 O_2 and NaC_3H_2O_2 d. all of the above The pK_a. of acetic acid. HC_2 H_3 O_2, is 4.75. What is the pH of buffer which [HC_2 H_3 O_2.] = 0.20 M and [NaC_2H_3O_2] = 2 0 M? a. 3.75 c. 5.75 b. 4.75 d. 7.00 A 0.15 M aqueous solution of the weak acid HA at 25.0 degree C has a pH of 5.35. The value of K_a. for HA is a. 3.0 times 10^- 5 b. 1.8 times 10^-5 c. 7.1 times 10^- 9 d. 1.3 times 10^- 39 e. 3.3 times 10^4 The pH of a 0.15 M aqueous solution of NaZ (the sodium salt of HZ) is 10.7 what is the K_a for HZ? a. 16 times 10^-6 b. 6.0 times 10^- 9 c. 8.6 times 10^- 4 d. 1.3 times 10^-12 e. 3.3 times 10^- 4 A branded-Lower acid a defined as a substance that __ a. increases K_a when placed in H_2 O b. deceases [H^+] when placed in H_2 O c. increases [OH] when placed in H_2O d. acts as i proton acceptor e. acts as a proton doner Nitric acid is a strong acid. This means that __. a. aqueous solutions of HNO_2, contain equal concentrates of H^+ (aq) and OH (aq) b. HNO_3 does not dissociate at all when it is dissolved in water c. HNO_3, dissociate completely so H^+ (aq) and NO_3 (aq) when it dissolves in water d. HNO_3, produces a gaseous product when It is neutralized e. HNO_3 cannot be neutralized by a weak base Which of the following ions will act as a base in water? a. HS' b. F' c. NO_2' d. CIO' e. All of the above will act as a base in water. A 0.1 M solution of __ has a pH of 7.0. a. Na_2 S b. KF c. Na NO_3 d. NH_4 Cl e. NaF
Which of the following solution can function as a buffer? a. a solution containing HCL and NaCI b. a solution containing NaOH and NaCl c. a solution containing HC_2 H_3 O_2 and NaC_3H_2O_2 d. all of the above The pK_a. of acetic acid. HC_2 H_3 O_2, is 4.75. What is the pH of buffer which [HC_2 H_3 O_2.] = 0.20 M and [NaC_2H_3O_2] = 2 0 M? a. 3.75 c. 5.75 b. 4.75 d. 7.00 A 0.15 M aqueous solution of the weak acid HA at 25.0 degree C has a pH of 5.35. The value of K_a. for HA is a. 3.0 times 10^- 5 b. 1.8 times 10^-5 c. 7.1 times 10^- 9 d. 1.3 times 10^- 39 e. 3.3 times 10^4 The pH of a 0.15 M aqueous solution of NaZ (the sodium salt of HZ) is 10.7 what is the K_a for HZ? a. 16 times 10^-6 b. 6.0 times 10^- 9 c. 8.6 times 10^- 4 d. 1.3 times 10^-12 e. 3.3 times 10^- 4 A branded-Lower acid a defined as a substance that __ a. increases K_a when placed in H_2 O b. deceases [H^+] when placed in H_2 O c. increases [OH] when placed in H_2O d. acts as i proton acceptor e. acts as a proton doner Nitric acid is a strong acid. This means that __. a. aqueous solutions of HNO_2, contain equal concentrates of H^+ (aq) and OH (aq) b. HNO_3 does not dissociate at all when it is dissolved in water c. HNO_3, dissociate completely so H^+ (aq) and NO_3 (aq) when it dissolves in water d. HNO_3, produces a gaseous product when It is neutralized e. HNO_3 cannot be neutralized by a weak base Which of the following ions will act as a base in water? a. HS' b. F' c. NO_2' d. CIO' e. All of the above will act as a base in water. A 0.1 M solution of __ has a pH of 7.0. a. Na_2 S b. KF c. Na NO_3 d. NH_4 Cl e. NaF
Beverley SmithLv2
8 Feb 2019