pH of water is 7 at $25^{\circ} \mathrm{C}$. If water is heated to $80^{\circ} \mathrm{C}$, it's pH

Question

pH of water is 7 at $25^{\circ} \mathrm{C}$. If water is heated to $80^{\circ} \mathrm{C}$, it's pH will\

Professor PC Thomas Classes · Answer

(b) : $\mathrm{p} K_{w}=\mathrm{pH}+\mathrm{pOH}=14$ (at $25^{\circ} \mathrm{C}$ ) With increase in temperature, $K_{w}$ of water increases. So, degree of dissociation of water increases hence, pH of water decreases.\