Question

Answer the following:
(1) What is the effect of temperature on ionic product of water $\left(Kw\right)$?
(2) What happen to the ionic product of water $\left(Kw\right)$ if some acid is added to it?

Answer 1

Answer the following:
(1) The effect of temperature on ionic product of water ( $K_w$)
With increase in temperature, the extent of the dissociation of water increases. Due to this, the ionic product of water increases.
At $0{}^{o}C$, $K_w=0.11\times {10}^{-14}$
At $10{}^{o}C$, $K_w=0.30\times {10}^{-14}$
At $25{}^{o}C$, $K_w=1.00\times {10}^{-14}$
At $1000{}^{o}C$, $K_w=7.50\times {10}^{-14}$
(2) The value of the ionic product of water ($K_w$) remains unchanged if some acid is added to it.
When an acid is added to pure water, hydrogen ion concentration increases and hydroxide ion concentration decreases. But the product of the hydrogen ion concentration and hydroxide ion concentration (i.e, ionic product of water) remains same.