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6-2.Equilibrium-II (Ionic Equilibrium)
medium
Write characteristics and uses of ${K_a}$ value.
Option A
Option B
Option C
Option D
Solution
The characteristics and uses of $\mathrm{K}_{a}$ value as under :
$(i)$ The value of $\mathrm{K}_{a}$ is larger, the stronger is the acid.
$(ii)$ $\mathrm{K}_{a}$ is a dimensionless quantity.
$(iii)$ $\left[\mathrm{H}^{+}\right]$of weak acid and $\mathrm{pH}$ calculate using of value of $\mathrm{K}_{a}$.
$(iv)$ Calculate the ionization degree $\alpha$ with the help of $K_{a}$ value.
$(v)$ $\mathrm{pK}_{a}$ is calculated by using the value of $\mathrm{K}_{a}$. $\mathrm{pK}_{a}=-\log \left(\mathrm{K}_{a}\right)$
If the $\mathrm{pK}_{a}$ value is more than the acid become less strong.
| $\mathrm{K}_{a}=1 \times 10^{-1}$ | $1 \times 10^{-2}$ | $1 \times 10^{-3}$ |
| $\mathrm{pK}_{a}=1$ | $2$ | $3$ |
Standard 11
Chemistry
