JEE Main 2017 — Ionic Equilibrium Question with Solution
From: JEE Main 2017 (Online) 8th April Morning Slot
Question
Additin of sodium hydroxide solution to a weak acid (HA)results in a buffer of pH 6. If ionition constant of HA is 105, the ratio of salt to acid concentration in the buffer solution will be :
Choose an option
Show full solutionCorrect option: C
Correct answer
C10 : 1
Step-by-step explanation
HA H+ + A
Ka = = 105
pH = pKa + log
6 = log [105] + log
6 = 5 + log
log = 1
= 10
Salt : Acid = 10 : 1
Ka = = 105
pH = pKa + log
6 = log [105] + log
6 = 5 + log
log = 1
= 10
Salt : Acid = 10 : 1
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