SATHEE: Equilibrium Question 285

Equilibrium Question 285

Question: $p K_{a}$ of acetic acid is $4.74$ . The concentration of $C H_{3} C O O N a$ is 0.01 M. The pH of $C H_{3} O O N a$ is [Orissa JEE 2004]

Options:

A) 3.37

B) 4.37

C) 4.74

D) 0.474

Show Answer

Answer:

Correct Answer: A

Solution:

$H^{+} = c, ., α = \sqrt{K_{a}, ., c}$

$p H = - \log {(\sqrt{K_{a} ., c})}^{1 / 2}$

$= \frac{1}{2} [- \log K_{a} - \log c]$

$= \frac{1}{2} [4.74 - \log 10^{- 2}]$

$= \frac{1}{2} [4.74 + 2] = 3.37$ .

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Equilibrium Question 285

Question: pKa of acetic acid is 4.74 . The concentration of CH3COONa is 0.01 M. The pH of CH3OONa is [Orissa JEE 2004]

Options:

Answer:

Solution:

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Question: $p K_{a}$ of acetic acid is $4.74$ . The concentration of $C H_{3} C O O N a$ is 0.01 M. The pH of $C H_{3} O O N a$ is [Orissa JEE 2004]