20 mL of a solution of acetic acid required 2 | vedclass

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

Question

(B) $1$. Calculate the initial moles of acetic acid $(CH_3COOH)$: Since $20 	ext{ mL}$ of acetic acid is neutralized by $28.4 	ext{ mL}$ of $0.1 	e

Vedclass · Accepted Answer

$4.75$

Vedclass · Answer

(B) $1$. Calculate the initial moles of acetic acid $(CH_3COOH)$: Since $20 	ext{ mL}$ of acetic acid is neutralized by $28.4 	ext{ mL}$ of $0.1 	ext{ M } NaOH$, the moles of acid = moles of base = $0.1 	ext{ M} 	imes 28.4 	ext{ mL} = 2.84 	ext{ mmol}$.$2$. Calculate the composition of solution $(X)$: Solution $(X)$ is formed by mixing $2.84 	ext{ mmol}$ of $CH_3COOH$ and $1.42 	ext{ mmol}$ of $NaOH$ $(0.1 	ext{ M} 	imes 14.2 	ext{ mL} = 1.42 	ext{ mmol})$.$3$. Reaction: $CH_3COOH + NaOH ightarrow CH_3COONa + H_2O$.$4$. After reaction: Remaining $CH_3COOH = 2.84 - 1.42 = 1.42 	ext{ mmol}$. Formed $CH_3COONa$ (salt) = $1.42 	ext{ mmol}$.$5$. Apply Henderson-Hasselbalch equation: $pH = pK_a + \log \left( \frac{[Salt]}{[Acid]} ight)$.$6$. Since $[Salt] = [Acid] = 1.42 	ext{ mmol}$, the ratio is $1$. Thus, $pH = 4.75 + \log(1) = 4.75 + 0 = 4.75$.

$20$ mL of a solution of acetic acid required $28.4$ mL of $0.1$ $M$ NaOH for its neutralization. $A$ solution $(X)$ was prepared by mixing $20$ mL of the above acetic acid and $14.2$ mL of $0.1$ $M$ NaOH solution. What is the pH of the solution $(X)$? ($pK_a$ value of acetic acid is $4.75$).

Similar Questions

$A$ 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 $NaA$.

The buffering action of a mixture of $CH_3COOH$ and $CH_3COONa$ is maximum when the ratio of salt to acid is equal to .......?

Components of a buffer solution are $0.1 \ M \ HCN$ and $0.2 \ M \ NaCN$. What is the $pH$ of the solution? (Given: $pK_a$ of $HCN = 9.30$)

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 $pH$ of an acidic buffer mixture is

Vedclass Test Series

Exam Paper Generator

Online Exam Module