At STP, the dissociation reaction of water is | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) The dissociation constant of water at $STP$ $(298 \ K)$ is $K_w = [H^{+}][OH^{-}] = 10^{-7} 	imes 10^{-7} = 10^{-14}$.The relation between standa

Vedclass · Accepted Answer

$19091 \ cal / mol$

Vedclass · Answer

(B) The dissociation constant of water at $STP$ $(298 \ K)$ is $K_w = [H^{+}][OH^{-}] = 10^{-7} 	imes 10^{-7} = 10^{-14}$.The relation between standard free energy change and equilibrium constant is $\Delta G^{\circ} = -RT \ln K_w = -2.303 RT \log K_w$.Given $R = 1.987 \ cal \ K^{-1} mol^{-1}$, $T = 298 \ K$, and $K_w = 10^{-14}$.$\Delta G^{\circ} = -2.303 	imes 1.987 	imes 298 	imes \log(10^{-14})$.$\Delta G^{\circ} = -2.303 	imes 1.987 	imes 298 	imes (-14)$.$\Delta G^{\circ} = 2.303 	imes 1.987 	imes 298 	imes 14 \approx 19091 \ cal / mol$.

At $STP$, the dissociation reaction of water is $H_2O \rightleftharpoons H^{+}(aq.) + OH^{-}(aq.)$, and the $pH$ of water is $7.0$. The change of standard free energy $(\Delta G^{\circ})$ for the above dissociation process is given by

Similar Questions

$A$ $20 \ mL$ sample of a $0.1 \ M$ solution of the weak monoprotic acid $HA$ is titrated with $0.25 \ M \ NaOH$. The volume of $NaOH$ solution required to reach the equivalence point is: ............. $mL$

When dilute $H_2SO_4$ is added to an aqueous solution of potassium chromate,the yellow color of the solution changes to orange. This indicates that .....

The initial rate of hydrolysis of methyl acetate $(1 \ M)$ by a weak acid $(HA, 1 \ M)$ is $1/100$th of that of a strong acid $(HX, 1 \ M)$ at $25^{\circ} C$. The $K_a$ of $HA$ is:

At $25 \, ^\circ C$,the dissociation constant of pure water is equal to .......

Given,$pH$ of a solution $A$ is $3$ and it is mixed with another solution $B$ having $pH$ $2$. If both are mixed in equal volume,then the resultant $pH$ of the solution will be

Vedclass Test Series

Exam Paper Generator

Online Exam Module