At certain temperature `K_(w)` for water `4xx10^(-14)` which of the following is incorrect for pure water at the given temperature?
`log 2=0.3`

Options

A. `pH=6.7` and water is acidic
B. `pH=6.7` and water is neutral
C. `pOH=6.7` and water is neutral
D. `pH+pOH=13.4`

Answer

A

Explanation

`[H^(+)][OH^(-)]=K_(w)=4xx10^(-14)`
In pure water `[H^(+)]=[OH^(-)]`
`:. [H^(+)]=2xx10^(-7)`
or `pH=7-log2=7-0.3=6.7=pOH`
pure water is neutral.