Acid ionization constants for H_2 Z and HZ^- are K_a1= 10^-7, and K_a2 = 10^-15

Question

Acid ionization constants for H_2 Z and HZ^- are K_a1= 10^-7, and K_a2 = 10^-15 respectively. Determine the 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^-15 e. none of these Determine the pH of 5.0 times 10^-7 M aqueous sulfuric acid; K_al > > >LARGE. K_a2 = 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, the acid is: a. 1 times 10^-4 b. 1 times 10^-5 c. 1 times 10^-6 d. 1 times 10^-7 d. 1 times 10^-7 e. none of these

Explanation / Answer

26) Answer c) 6.0

calculation:

For strong acids pH = -log (f* concentration of H+)

For H2SO4 :[ H+ ] = 2 * [ H2SO4]

= 2 * 5.0*10^-7

=0.000001

pH = - log (0.000001)

pH = 6.0

27) H2S gives H+ and HS-

Answer : D (1*10^ - 7)

calculation

Ka = [ HS-] [ H +]/ [H2S]

we have to find 10 ^-pH

10^-4

=0.0001

Ka = (0.0001)^2/0.1 M- (0.0001)

Ka= 1* 10^-7

25) Answer C

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