20 text{ mL} of 0.1 text{ M} acetic acid is m | vedclass

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

Question

(B) The mixture of acetic acid $(CH_3COOH)$ and potassium acetate $(CH_3COOK)$ forms an acidic buffer. Using the Henderson-Hasselbalch equation: $pH =

Vedclass · Accepted Answer

$0.04$

Vedclass · Answer

(B) The mixture of acetic acid $(CH_3COOH)$ and potassium acetate $(CH_3COOK)$ forms an acidic buffer. Using the Henderson-Hasselbalch equation: $pH = pK_a + \log\left(\frac{[	ext{Salt}]}{[	ext{Acid}]}ight)$. First,calculate $pK_a$: $pK_a = -\log(1.8 	imes 10^{-5}) \approx 4.74$. Let the concentration of potassium acetate be $M$. The number of moles of acid $= 0.1 	imes 20 = 2 	ext{ mmol}$. The number of moles of salt $= M 	imes 50 = 50M 	ext{ mmol}$. Substituting the values into the equation: $4.8 = 4.74 + \log\left(\frac{50M}{2}ight)$. $0.06 = \log(25M)$. Taking antilog on both sides: $10^{0.06} = 25M$. Since $10^{0.06} \approx 1.15$,we have $25M = 1.15$. $M = \frac{1.15}{25} = 0.046 	ext{ M}$. Rounding to the nearest provided option,$M \approx 0.04 	ext{ M}$.

$20 \text{ mL}$ of $0.1 \text{ M}$ acetic acid is mixed with $50 \text{ mL}$ of potassium acetate. $K_a$ of acetic acid $= 1.8 \times 10^{-5}$ at $27^\circ \text{C}$. Calculate the concentration of potassium acetate if the $pH$ of the mixture is $4.8$. (in $\text{ M}$)

Similar Questions

$A$ sinusoidal voltage of peak value $200 \ V$ is connected to a diode and a resistor $R$ in the circuit shown,such that half-wave rectification occurs. If the forward resistance of the diode is negligible compared to $R$,the rms voltage (in volt) across $R$ is approximately:

If $x=-1$ and $x=2$ are extreme points of $f(x)=\alpha \log |x|+\beta x^2+x, (x \neq 0)$, then

If $\alpha, \beta, \gamma$ are the roots of $x^3+4x+1=0$,then the equation whose roots are $\frac{\alpha^2}{\beta+\gamma}, \frac{\beta^2}{\gamma+\alpha}, \frac{\gamma^2}{\alpha+\beta}$ is

Which of the following tissues is present in the leaves of $Pinus$ and serves to conduct water and food?

If the lines $x^2+2xy-35y^2-4x+44y-12=0$ and $5x+\lambda y-8=0$ are concurrent,then $\lambda$ equals

Vedclass Test Series

Exam Paper Generator

Online Exam Module