Answer the following three questions: a) What is the pH of an aqueous solution w

Question

Answer the following three questions: a) What is the pH of an aqueous solution with a hydrogen ion concentration of [H^+] = 8.9 times 10^-7 M? pH = What is the hydroxide ion concentration, [OH^-], in an aqueous solution with a hydrogen ion concentration of [H^+] = 8.9 times 10^-7 m? [OH^-] = c) A monoprotic acid, HA, dissociates: HA H^+ + A^- The equilibrium concentration of the reactants and products are [HA] = 0.240 M [H^+] = 4.00 times 10^-4 M [A^-] = 4.00 times 10^-4 M Calculate the K_a value for the acid HA.

Explanation / Answer

Question a

pH = -log10[]

pH = -log10(8.9 x 10-7)
pH = 6.050.

Question b

Kw = [H+][OH-] = 1x10-14 at 25°C

Since we know the concentration of H+ ion we can calculate the OH- concentration

8.9 x 10-7 [OH-] = 1x10-14

[OH-] = 1x10-14 / 8.9 x 10-7

[OH-] =  1.1235 x 10-8

Question C

Ka = ( [H+] [A¯] ) / [HA]

Ka = [(4.0x 10¯4) (4.0 x 10¯4)] / 0.24

Ka = 6.67 x 10-7

Ka =

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