Question

(a) Calculate the H3O+ concentration in an aqueous solution at 25° C with an OH− concentration of 1.17 × 10^−5 M.

_____________x10_________M

(b) The value of Kw at 100° C is 5.13 × 10^−13. Calculate the H3O+ concentration from the above solution at 100° C.

_____________x10_________M

Answer 1

(a) At 25 ^oC , value of K_w = 1.00 x 10^-14

[H₃O⁺] = K_w / [OH^-]

[H₃O⁺] = (1.00 x 10^-14) / (1.17 x 10^-5 M)

[H₃O⁺] = 8.55 x 10^-10 M

(b) At 100 ^oC , value of K_w = 5.13 x 10^-13

[H₃O⁺] = K_w / [OH^-]

[H₃O⁺] = (5.13 x 10^-13) / (1.17 x 10^-5 M)

[H₃O⁺] = 4.38 x 10^-8 M