The $pH$ of a solution is increased from $3$ to $6$. Its ${H^{+}}$ ion concentration will be

What is the concentration of $OH^{-}$ ion in a solution containing $0.05 \ M \ H^{+}$ ions?

Calculate the hydrogen ion concentration in the following biological fluids whose $pH$ are given below:
$(a)$ Human muscle-fluid,$6.83$
$(b)$ Human stomach fluid,$1.2$
$(c)$ Human blood,$7.38$
$(d)$ Human saliva,$6.4$

The standard Gibbs energy change for the reaction $H_2O \rightleftharpoons H^{+} + OH^{-}$ at $25 \, ^\circ C$ is $... \ kJ$.

At $100\, ^oC$,the $K_w$ of water is $55$ times its value at $25\, ^oC$. What will be the $pH$ of a neutral solution at this temperature? $(\log 55 = 1.74)$

The $H^{+}$ ion concentration is $1.0 \times 10^{-6} \ mol/L$ in a solution. Its $pH$ value will be