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Ionic Equilibrium I
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Buffer solutions and Henderson equation
JEE Advanced level
Single correct option
Difficulty 3 of 3
ie147
What amount of solid NaOH (no volume change) must be added to 1.0 L of 0.20 M weak acid HA (
p
K
a
=
4.74
) to make a solution of pH 5.74?
A
0.100 mol
B
0.182 mol
C
0.200 mol
D
0.020 mol
Answer: B
pH - pKa = 1, so salt/acid = 10. With x mol NaOH,
x
/
(
0.20
−
x
)
=
10
,
x
=
2.0/11
=
0.182
mol.
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