Question:

Solubility product of $ BaCl_{2}$ is $ 4\times 10^{-9}$ . Its solubility would be:

Updated On: Jul 28, 2022
  • $ 1\times 10^{-27}$
  • $ 1\times 10^{-3}$
  • $ 1\times 10^{-7}$
  • $ 1\times 10^{-2}$
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The Correct Option is B

Solution and Explanation

$BaCl _{2}$ is a ternary electrolyte. $BaCl _{2}= \underset{s}{Ba^{2+}}+\underset{2s}{2 Cl ^{-}}$ $K_{s p} =\left[ Ba ^{2+}\right]\left[ Cl ^{-}\right]^{2}$ $=[s][2 s ]^{2}$ $K_{s p} =4 s^{3}$ $K_{s p} =4 s^{3}$ where s=molar solubility $4 s^{3} =4 \times 10^{-9}$(given) or $s=10^{-3} M$
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Concepts Used:

Buffer solutions

The buffer solution is a solution that is able to maintain its Hydrogen ion concentration (pH) with only minor changes on the dilution or addition of a small amount of either acid or base. They are used in fermentation, food preservatives, drug delivery, printing, the activity of enzymes and many more.

Buffer solutions are aqueous solutions containing a weak acid and its salt - acid buffer or a weak base and its salt - base buffer.

Types of Buffer Solution

Acidic Buffers

These solutions are used to maintain acidic environments. Also, it has acidic pH and is prepared by mixing a weak acid and its salt with a strong base. An aqueous solution of an equal concentration of acetic acid and sodium acetate has a pH of 4.74.

Alkaline Buffers

These solutions are used to maintain basic conditions. It has a basic pH and is prepared by mixing a weak base and its salt with strong acid. The aqueous solution of an equal concentration of ammonium hydroxide and ammonium chloride has a pH of 9.25.