Write characteristics and uses of ${K_a}$ value.
Write characteristics and uses of ${K_a}$ value.
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.
| $\mathrm{K}_{a}=1 \times 10^{-1}$ | $1 \times 10^{-2}$ | $1 \times 10^{-3}$ |
| $\mathrm{pK}_{a}=1$ | $2$ | $3$ |
Similar Questions
A solution of sodium borate has a $pH$ of approximately
A solution of sodium borate has a $pH$ of approximately
Given
$(i)$ $\begin{gathered}
HCN\left( {aq} \right) + {H_2}O\left( l \right) \rightleftharpoons {H_3}{O^ + }\left( {aq} \right) + C{N^ - }\left( {aq} \right) \hfill \\
{K_a} = 6.2 \times {10^{ - 10}} \hfill \\
\end{gathered} $
$(ii)$ $\begin{gathered}
C{N^ - }\left( {aq} \right) + {H_2}O\left( l \right) \rightleftharpoons HCN\left( {aq} \right) + O{H^ - }\left( {aq} \right) \hfill \\
{K_b} = 1.6 \times {10^{ - 5}} \hfill \\
\end{gathered} $
These equilibria show the following order of the relative base strength
Given
$(i)$ $\begin{gathered}
HCN\left( {aq} \right) + {H_2}O\left( l \right) \rightleftharpoons {H_3}{O^ + }\left( {aq} \right) + C{N^ - }\left( {aq} \right) \hfill \\
{K_a} = 6.2 \times {10^{ - 10}} \hfill \\
\end{gathered} $
$(ii)$ $\begin{gathered}
C{N^ - }\left( {aq} \right) + {H_2}O\left( l \right) \rightleftharpoons HCN\left( {aq} \right) + O{H^ - }\left( {aq} \right) \hfill \\
{K_b} = 1.6 \times {10^{ - 5}} \hfill \\
\end{gathered} $
These equilibria show the following order of the relative base strength
- [AIEEE 2012]
Derive the equation of ionization constants ${K_a}$ of weak acids $HX$.
Derive the equation of ionization constants ${K_a}$ of weak acids $HX$.
$5.0$ $pH$ containing solution is dilute $100$ times. Calculate $pH$ of dilute solution.
$5.0$ $pH$ containing solution is dilute $100$ times. Calculate $pH$ of dilute solution.
Which oxychloride has maximum $pH$
Which oxychloride has maximum $pH$