Ionic Equilibrium Test

Result

Ionic Equilibrium Test - 5

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Question 1
1 / -0

In case of a buffer solution containing equimolar amount of ammonium hydroxide and ammonium chloride, the reserve basicity of the solution is due to the presence of

A
ammonium hydroxide molecules

B
ammonium ions

C
ammonium chloride molecules

D
chloride ions

Solution

In case of a buffer solution containing equimolar amount of ammonium hydroxide and ammonium chloride, the reserve basicity of the solution is due to the presence of ammonium hydroxide molecules.
Question 2
1 / -0

A 100 ml of solution of pH = 2 is mixed with 100 ml of another solution of pH = 4. The pH of the resulting mixture will be

A
1.12

B
2.01

C
2.29

D
3.40

Solution

[H₃O⁺] in solution of (pH = 2) = 10^-2
[H₃O⁺] in solution of (pH = 4) = 10^-4
M₁V₁ + M₂V₂ = M₃V₃
10^-2 x 100 + 10^-4 x 100 = M₃ x 200
1 + 0.01 = M₃ x 200
M₃ = 1.01/200 = 5.05 x 10^-3
∴ [H₃O⁺] after mixing = 5.05 x 10^-3
pH = -log [H₃O⁺]
pH = -log (5.05 x 10^-3)
pH = -(log 5.05 - 3log 10)
pH = 2.29