Question

The correct statements
A) $p^H$ of water decreases with increase in temperature
B) $p^H$ of water remains same with increase in temperature
C)$p^H$ of water decreases with the addition of acid
D)Degree of dissocation of water is independent of temperature

• A. All are correct
• B. A and C are correct
• C. B, C and D are correct
• D. D is correct

Answer 1

The correct option is B A and C are correct

pH = -log[H+]
ionic product of water (Kw) = $\left[H^{+}\right]$ x $\left[O{H}^{-}\right]$
As temperature increases, kw value increases, hence [H+] increases. As a result, pH decreases.
When acid is added, [H+] of water increases and pH decreases.