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

Question

Answer the following three questions:

a.) What is the pH of an aqueous solution with a hydrogen ion concentration of [H^+] =6.1 x 10^-7 M?

pH =???

b.) What is the hydroxide ion concentration, [OH^-], in an aqueous solution with a hydrogen ion concentration of [H^+]=6.1 x 10^-7 M?

[OH^-]= ????

c.)A monoprotic acid, HA, dissociates:

HA = H^+ + A^-

The equilibrium concentrations of the reactants and products are

[HA]=0.100M

[H^+]=4.00 x 10^-4 M

[A^-]=4.00 x 10^-4 M

calculate the Ka value for the acid HA.

Ka=???

Explanation / Answer

a) pH = -log [H+] = -log ( 6.1 x 10^-7) = 6.215

b) [OH-] = 10^-14 / [H+] = 10^ -14 / ( 6.1 x10^-7) = 1.64 x 10^ -8 M

c) Ka = [H+] [A-] /[HA]

Ka = ( 4x10^-4) (4x10^-4) / ( 0.1) = 1.6 x 10^- 6

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