Question

Given that Kw for water is 2.4 x 10-14 at 37 °C, calculate the pH of a neutral aqueous solution at 37 °C, which is the normal human body temperature. PH - Is a pH 7.00 solution acidic, basic, or neutral at 37 °C? O acidic O basic O neutral

Answer 1

i)

Answer

pH = 6.81

Explanation

H2O(l) + H2O(l) <------> H3O⁺(l) + OH^-(aq)

K_w = [H3O⁺][OH^-] = 2.4×10^-14

[H3O⁺] = [OH^-]

x² = 2.4×10^-14

x = 1.55×10^-7

[H3O⁺] = 1.55×10^-7M

pH = - log(H3O⁺)

pH = -log(1.55×10^-7) = 6.81

ii)

Basic

at 37℃ , a solution will be neutral at pH = 6.81. So, pH=7 solution at 37℃ will be basic