Question

Neutralization always produces a solution of $pH=7$. If true write 1, else write 0.

Answer 1

At ${25}^{o}C$, $K_w=\left[H^{+}\right]\left[O{H}^{-}\right]={10}^{-7}\times {10}^{-7}={10}^{-14}$

So $pH+pOH=14$ at this temperature and neutral solution will have pH = 7.

But as we increase temperature, more no of water molecule will dissociate and number of ions will increase. So as we increase the temperature $K_w$ increases and $pH+pOH$ decreases.

So neutral solution will have pH less than 7.