Question

When the temperature of a sample of pure water is raised above 25 °C,(1)the hydronium ion concentration will be greater than the hydroxide ion concentration.(2)the hydronium ion concentration will be less than the hydroxide ion concentration.(3)the value of Kw will increase.(4)the hydronium ion concentration could change to 1.0 × 10−10 M.(5)the hydroxide ion concentration could change to 1.0 × 10−10 M.

Answer 1

The correct answer is option 3.

Step-by-step explanation:

`H_2O\rightleftharpoons H^++OH^-`

The expression of
`K_w` is given by :

`K_w=[H^+][OH^-]`

`K_w\propto [H^+]`

`K_w\propto [OH^-]`

Rise in temperature will result in more dissociation of water molecules into hydrogen ions and hydroxide ions.

With an increase in concentration of hydrogen ions and hydroxide ions value of
`K_w` will also increase.