Calculate the pH of a buffer solution prepare | vedclass

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

Question

(A) $1$. Calculate the millimoles of reactants: $n(CH_3COOH) = 100 \ mL 	imes 0.1 \ M = 10 \ mmol$ $n(NaOH) = 30 \ mL 	imes 0.1 \ M = 3 \ mmol$ $2$.

Vedclass · Accepted Answer

$4.38$

Vedclass · Answer

(A) $1$. Calculate the millimoles of reactants: $n(CH_3COOH) = 100 \ mL 	imes 0.1 \ M = 10 \ mmol$ $n(NaOH) = 30 \ mL 	imes 0.1 \ M = 3 \ mmol$ $2$. Reaction: $CH_3COOH + NaOH ightarrow CH_3COONa + H_2O$ After reaction: $n(CH_3COOH)_{remaining} = 10 - 3 = 7 \ mmol$ $n(CH_3COONa)_{formed} = 3 \ mmol$ $3$. Use Henderson-Hasselbalch equation: $pH = pK_a + \log(\frac{[Salt]}{[Acid]}) = 4.76 + \log(\frac{3}{7})$ $pH = 4.76 + \log(0.428) = 4.76 - 0.368 = 4.392 \approx 4.39$

Calculate the $pH$ of a buffer solution prepared by mixing $30 \ mL$ of $0.1 \ M$ $NaOH$ and $100 \ mL$ of $0.1 \ M$ $CH_3COOH$. (Given: $pK_a$ of $CH_3COOH = 4.76$)

Similar Questions

Equal volumes of $0.5 \ N$ acetic acid and $0.5 \ N$ sodium acetate are mixed. What is the $pH$ of the resultant solution? $(pK_{a}$ of acetic acid $= 4.75)$

The $pKa$ of a weak acid $HA$ is $4.5$. The $pOH$ of an aqueous buffer solution in which the acid $HA$ is $50\%$ ionized is:

Which buffer is present in human blood :-

Which of the following mixtures forms an acidic buffer?

$0.1 \ M$ formic acid solution is titrated against $0.1 \ M \ NaOH$ solution. What would be the difference in $pH$ between $1/5$ and $4/5$ stages of neutralization of acid?

Vedclass Test Series

Exam Paper Generator

Online Exam Module