0.01 moles of a weak acid HA left( K _{ a }=2 | vedclass

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

Question

$\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\quad\quad\quad HA \rightleftharpoons \quad H ^{+}+\quad A ^{-}$

Initial conc. $\quad0.01 M\quad \, 0.1 M \qua

Vedclass · Accepted Answer

$2$

Vedclass · Answer

$\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\quad\quad\quad HA ightleftharpoons \quad H ^{+}+\quad A ^{-}$

Initial conc. $\quad0.01 M\quad \, 0.1 M \quad\quad 0$

Equ. conc. $\,(0.01- x )\quad(0.1+ x )\quad xM$

Now, $K_{a}=\frac{\left[x^{+}ight]\left[A^{-}ight]}{[H A]} \Rightarrow 2 	imes 10^{-6}=\frac{0.1 	imes x}{0.01}$

$	herefore \quad x=2 	imes 10^{-7}$

Now, $\alpha=\frac{x}{0.01}=\frac{2 	imes 10^{-7}}{0.01}=2 	imes 10^{-5}$

Similar Questions

For a weak acid $HA,$ Ostwald's dilution law is represented by the equation

It has been found that the $pH$ of a $0.01$ $M$ solution of an organic acid is $4.15 .$ Calculate the concentration of the anion, the ionization constant of the acid and its $p{K_a}$

Write characteristics and uses of ${K_a}$ value.

The ionization constant of propanoic acid is $1.32 \times 10^{-5}$. Calculate the degree of ionization of the acid in its $0.05\, M$ solution and also its $pH$. What will be its degree of ionization if the solution is $0.01$ $M$ in $HCl$ also?

Calculate the degree of ionization of $0.05 \,M$ acetic acid if its $p K_{ a }$ value is $4.74$

How is the degree of dissociation affected when its solution also contains $(a)$ $0.01 \,M$ $(b)$ $0.1 \,M$ in $HCl$ ?