Which of the following is a buffer solution?

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

Question

(D) buffer solution is formed when a weak acid reacts with a limited amount of a strong base,or a weak base reacts with a limited amount of a strong a

Vedclass · Accepted Answer

All of these

Vedclass · Answer

(D) buffer solution is formed when a weak acid reacts with a limited amount of a strong base,or a weak base reacts with a limited amount of a strong acid,resulting in a mixture of the weak electrolyte and its conjugate salt.$(A)$ $100 \ mL, 0.1 \ M \ CH_3COOH$ $(10 \ mmol)$ + $100 \ mL, 0.05 \ M \ NaOH$ $(5 \ mmol)$: This results in $5 \ mmol$ of $CH_3COOH$ and $5 \ mmol$ of $CH_3COONa$,forming an acidic buffer.$(B)$ $200 \ mL, 0.1 \ M \ NH_4OH$ $(20 \ mmol)$ + $200 \ mL, 0.08 \ M \ HCl$ $(16 \ mmol)$: This results in $4 \ mmol$ of $NH_4OH$ and $16 \ mmol$ of $NH_4Cl$,forming a basic buffer.$(C)$ $300 \ mL, 0.1 \ M \ NaOH$ $(30 \ mmol)$ + $500 \ mL, 0.1 \ M \ C_6H_5COOH$ $(50 \ mmol)$: This results in $20 \ mmol$ of $C_6H_5COOH$ and $30 \ mmol$ of $C_6H_5COONa$,forming an acidic buffer.Since all options result in a mixture of a weak acid/base and its salt,all are buffer solutions.

Similar Questions

At $25 \, ^\circ C$,the $K_a$ for $HCN$ is $5 \times 10^{-10}$. What volume (in $mL$) of $5 \, M \, KCN$ solution must be added to $10 \, mL$ of $2 \, M \, HCN$ solution to maintain a constant $pH$ of $9$?

Assertion : Buffer system of carbonic acid and sodium bicarbonate is used for the precipitation of hydroxides of third group elements.
Reason : It maintains the $pH$ to a constant value,about $7.4.$

The $pK_b$ of $CN^{\Theta}$ is $4.7$. The $pH$ of a solution prepared by mixing $2.5 \ mol$ of $KCN$ and $2.5 \ mol$ of $HCN$ in water and making the total volume up to $500 \ mL$ is:

Which of the following mixtures will form a buffer solution?

In a buffer solution containing equal concentration of $B^{-}$ and $HB,$ the $K_b$ for $B^{-}$ is $10^{-10}.$ The $pH$ of the buffer solution is:

Vedclass Test Series

Exam Paper Generator

Online Exam Module