Question

At 2525 °c, what is the hydroxide ion concentration, [oh−][oh−] , in an aqueous solution with a hydrogen ion concentration of [h ]=1. 5×10−6[h ]=1. 5×10−6 m?

Answer 1

The hydroxide ion concentration [OH-] in an aqueous solution is 6.66 x 10⁻⁹ M

Experimental measurements of the pKw of water at 25ºC yielded a result of 14.0. The same method used to determine the pKa of all other water-soluble compounds that can function as acids in aqueous solution can also be used to determine this value from the examination of thermodynamic or electrochemical data for these aqueous solutions.

Water has a pkw=14

So it can be represented as,

[H+] [OH-] = 1×10^-14

Given [H+] = 1. 5×10^−6

So, [OH-] = (1*10^-14) / ( 1.5*10^-6)

               = 6.66 x 10⁻⁹ M

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