Acid ionization constants for H_2 Z and HZ are K_al = 10^-7 and K_a2 = 10^-15, r

Question

Acid ionization constants for H_2 Z and HZ are K_al = 10^-7 and K_a2 = 10^-15, respectively. Determine the molar concentration of the Z^2+ ion produced in a 0.10 M aqueous solution of H_2 Z. a. 10^-30 b. 10^-22 c. 10^-45 d. 10^-7 e. none of these Determine the pH of 5.0 X 10^-7 M aqueous sulfuric acid; K_a1 > > > LARGE, K_a = 0 0.013. a. 1.0 b. 5.0 c. 6.0 d. 6.3 e. none of these A 0.1 M solution of the hypothetical weak acid HSp is found to have a pH of exactly 4.0. The ionization constant, K_a, of the acid is: a. 1 x 10^-4 b. 1 x 10^-5 c. 1 X 10^-6 d. 1 x 10^-7 e. none of these The K_sp for MZ, is 1.6 X 10^-9. What is the molar solubility of MZ in pure water? (Z does hydrolyze) a. 2.0 X 10^-8 b. 3.0 X 10^-8 c. 1.6 X 10^-7 d. 4.0 X 10^-4 e. none of these

Explanation / Answer

answer of 25.

Important equation for H2Z

H2Z + 2H2O <=> 2H3O+ + Z-

Therefore Ka = [H3O+]2 [ Z-] / [H2Z]

Concentration of H3O+ is double than Z- after dissociation , consider x is the concentration of Z-

10-7= 2x2 * x / 0.1

10-8= 2x3

x = 1.7 M is the concentration of Z- after dissociation.

therefofe answer for 25. is e) none of these

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