1.

At a particular temperature, the K_w of a neutral solution was equal to 4 times 10^-14. Calculate the concentration of [H_3O^+] and [OH^-].

Answer»

SOLUTION :GIVEN solution is neutral
`THEREFORE [H_3O^+]=[OH^-]` LET `[H_3O^+]=x,` then `[OH^-]=x`
`K_w=[H_3O^+][OH^-]`
`4 times 10^-14=x.x`
`x^2=4 times 10^-14`
`x=sqrt(4 times 10^-14)=2 times 10^-7`


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