Question

Neutralization always produces a solution of pH=7.

• A. True
• B. False

Answer 1

The correct option is B False

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.

Neutral solution will have pH = 7.

But as we increase temperature, more water molecules will dissociate and the 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.