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Ionic Equilibrium question bank (Chemistry)

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Q1.

The Basic buffer solution is made with $0.1\ \text{M}\ \text{NH}_4\text{OH}$ and $0.2\ \text{M}\ \text{NH}_4\text{Cl}$. If $K_b$ for the base is $1.8 \times 10^{-5}$, what is the pH of the buffer?

(A)

$4.74$

(B)

$9.26$

(C)

$8.96$

(D)

$5.05$

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Q2.

Which of the following buffer solutions is used for precipitation of cations of the III A group?

(A)

$\text{HF} + \text{NaF}$ in water.

(B)

$\text{HCOOH} + \text{HCOONa}$ in water

(C)

$\text{NH}_4\text{OH} + \text{NH}_4\text{Cl}$ in water.

(D)

$\text{CH}_3\text{COOH} + \text{CH}_3\text{COONa}$ in water.

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