Question

At certain temperature the value of $\mathrm{pKw}$ is $13.4$ the measured $\mathrm{pH}$ of a solution at same temperature is $7$. The solution is

Answer 1

$\mathrm{pH}$:

• Applying the formula for, $\mathrm{Kw}=\left[{\mathrm{H}}^{+}\right]\left[{\mathrm{OH}}^{-}\right]=13.4$
• In neutral case $\left[{\mathrm{H}}^{+}\right]=\left[{\mathrm{OH}}^{-}\right]$
• The resultant $\mathrm{pH}$ in the situation mentioned above is $6.7$.
• Thus, since the $\mathrm{pH}$ of the supplied solution is larger than the neutral $\mathrm{pH}$ of $7$, which is $7$.
• We may infer that the $\mathrm{pH}$ of the solution, assuming it is $7$, must be basic in nature.

Final Answer:

The solution is basic in nature.