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12th Standard English Medium Chemistry Subject Ionic Equilibrium Creative 2 Mark Questions with Solution Part - II updated Creative Questions

Published on: 13/05/2022

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Std: 12th Standard - Chemistry

chapter: - Creative Questions

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Questions:

Generic 2

5 x 2 = 10

Why is aqueous solution of FeCl₃ acidic?

Calculate the ionisation constant for the conjugate base of HF. Ionisation constant of HF at 298 K is 6.8 x 10^-4

BF₃ is termed as an acid though it does not contain H⁺ ions. Explain.

Magnesium is not precipitated from a solution of its salt by a mixture of NH₄OH and NH₄Cl. Explain

Give a condition for a compound to be precipitated.

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Answers Key:

Generic 2

5 x 2 = 10

FeCl₃ when dissolved in water gives strong acid HCl and a weak base Fe(OH)₃ A strong acid ionises completely so concentration of H⁺ ion becomes much greater than OH^- ion. So, aqueous solution of FeCl₃ is acidic.

The conjugate base of HF is F^-
For F^-, \({ K }_{ b }=\frac { { K }_{ w } }{ { K }_{ a } } =\frac { { 10 }^{ -14 } }{ { 6.8\times 10 }^{ -14 } } \)
= 1.47 x 10^-11.

According to Lewis concept of Acid and bases, any species capable of accepting an electron pair is an acid. BF₃ is electron deficient so accepts a pair of electron, Hence termed as acid

Magnesium has to precipitate as Mg(OH)₂ when treated with NH₄OH, but addition of NH₄CI will suppress the ionisation of NH₄OH due to common ion effect. So ionic product of Mg²⁺ and OH^-ions will be less than the solubility product (K_sp) of Mg(OH)₂. Hence will not precipitate.

When the product of molar concentration of the constituent ions i.e., ionic product, exceeds the solubility product then the compound gets precipitated. Ionic product > K_sp, precipitation will occur and the solution is super saturated.