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KHS Can Act as a Weak Acid or a Weak

Question 125

Multiple Choice

KHS can act as a weak acid or a weak base.
HS-(aq) + H2O(l) KHS can act as a weak acid or a weak base. HS<sup>-</sup>(aq)  + H<sub>2</sub>O(l)    S<sup>2-</sup>(aq)  + H<sub>3</sub>O<sup>+</sup>(aq)    K<sub>a2</sub> = 1.3 x 10<sup>-13</sup> HS<sup>-</sup>(aq)  + H<sub>2</sub>O(l)    H<sub>2</sub>S(aq)  + OH<sup>-</sup>(aq)    K<sub>b2</sub> = 1.0 x 10<sup>-7</sup> Which of the following statements is correct? A)  A solution of 0.1 M K<sub>2</sub>S and 0.1 M KHS will be acidic. B)  A solution of 0.01 M H<sub>2</sub>S will have a pH = 2. C)  A solution of 0.1 M KHS will be weakly basic. D)  H<sub>2</sub>S is over 90% ionized in water solution. E)  The S<sup>2-</sup> ion concentration in a 0.1 M KHS solution does not depend on pH. S2-(aq) + H3O+(aq)   Ka2 = 1.3 x 10-13
HS-(aq) + H2O(l) KHS can act as a weak acid or a weak base. HS<sup>-</sup>(aq)  + H<sub>2</sub>O(l)    S<sup>2-</sup>(aq)  + H<sub>3</sub>O<sup>+</sup>(aq)    K<sub>a2</sub> = 1.3 x 10<sup>-13</sup> HS<sup>-</sup>(aq)  + H<sub>2</sub>O(l)    H<sub>2</sub>S(aq)  + OH<sup>-</sup>(aq)    K<sub>b2</sub> = 1.0 x 10<sup>-7</sup> Which of the following statements is correct? A)  A solution of 0.1 M K<sub>2</sub>S and 0.1 M KHS will be acidic. B)  A solution of 0.01 M H<sub>2</sub>S will have a pH = 2. C)  A solution of 0.1 M KHS will be weakly basic. D)  H<sub>2</sub>S is over 90% ionized in water solution. E)  The S<sup>2-</sup> ion concentration in a 0.1 M KHS solution does not depend on pH. H2S(aq) + OH-(aq)   Kb2 = 1.0 x 10-7
Which of the following statements is correct?


A) A solution of 0.1 M K2S and 0.1 M KHS will be acidic.
B) A solution of 0.01 M H2S will have a pH = 2.
C) A solution of 0.1 M KHS will be weakly basic.
D) H2S is over 90% ionized in water solution.
E) The S2- ion concentration in a 0.1 M KHS solution does not depend on pH.

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