Buffer solutions have constant acidity and al | vedclass

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

Question

(A) If a small amount of an acid or alkali is added to a buffer solution,it converts them into unionised acid or base. Thus,the $pH$ remains unaffecte

Vedclass · Accepted Answer

these give unionised acid or base on reaction with added acid or alkali

Vedclass · Answer

(A) If a small amount of an acid or alkali is added to a buffer solution,it converts them into unionised acid or base. Thus,the $pH$ remains unaffected or in other words,its acidity/alkalinity remains constant. For example: $H_3O^{+} + A^{-} \rightleftharpoons H_2O + HA$ $OH^{-} + HA \rightarrow H_2O + A^{-}$ If an acid is added,it reacts with the conjugate base $A^{-}$ to form undissociated $HA$. Similarly,if a base/alkali is added,$OH^{-}$ combines with $HA$ to give $H_2O$ and $A^{-}$,and thus,maintains the acidity/alkalinity of the buffer solution.

Buffer solutions have constant acidity and alkalinity because

Similar Questions

Which of the following is a buffer solution?

The $pH$ of a simple sodium acetate buffer is given by $pH = pK_a + \log \frac{[Salt]}{[Acid]}$. $K_a$ of acetic acid $= 1.8 \times 10^{-5}$. If $[Salt] = [Acid] = 0.1 \, M$,the $pH$ of the solution would be about

The condition for minimum change in $pH$ for a buffer solution is

$50 \ mL$ of $0.02 \ M$ $NaOH$ solution is mixed with $50 \ mL$ of $0.06 \ M$ acetic acid solution. The $pH$ of the resulting solution is $......$ ($pK_a$ of acetic acid is $4.76$,$\log 2 = 0.30$).

$A$ weak acid,$HA$,is found to be $10\%$ ionized in $0.01\ M$ aqueous solution. Calculate the $pH$ of a solution which is $0.1\ M$ in $HA$ and $0.05\ M$ in $NaA$.

Vedclass Test Series

Exam Paper Generator

Online Exam Module