Question

At 25ºC the pH of 0.01 M KOH is 12. If the temperature of
this solution is raised to 50ºC without changing the volume,
which of the following is correct ?
(a) Both pH and pOH will remain constant
(b) pH will decrease while pOH willl remain constant
(c) pH will increase while pOH will remain constant
(d) pH will increase while pOH will decrease.

Answer 1

Hello Friend...!!

The answer of u r question is..!!

Option.B

Thank you.!!

Answer 2

The correct option is option (d) pH will increase while pOH will decrease.

• pH for acid is generally less than 7 and for the base, it is more than 7 at 25 degrees Celsius.
• KOH is base and its's pH lies in the base region.
• On increasing the temperature dissociation of acid that is H+ ions increases and the dissociation of the base that is OH- increases.
• pH is inversely proportional to H+ ion concentration. similarly, pOH is inversely proportional to OH- ion concentration.
• As OH- ion concentration increases in KOH with an increase in temperature that means pOH will decrease and pH will increase.
• There is a shifting of neutral points with an increase in temperature. it shifts left to the pH scale.