Question:
$H_2S$ is a toxic gas used in qualitative analysis. If solubility of $H_2S$ in water at $STP$ is $0.195\, m$, what is the value of $K_H$ ?
$H_2S$ is a toxic gas used in qualitative analysis. If solubility of $H_2S$ in water at $STP$ is $0.195\, m$, what is the value of $K_H$ ?
Updated On: Jun 23, 2023
- $0.0263 \,bar$
- $69.16 \,bar$
- $192 \,bar$
- $282 \,bar$
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The Correct Option is D
Solution and Explanation
No. of moles of $H_2S = 0.195$
No. of moles of $H_{2}O = \frac{1000}{18} = 55.55\,mol$
Mole fraction of $H_{2}S =\frac{0.195}{0.195 + 55.55} = 0.0035$
Pressure at $STP = 0.987$ bar
According to Henry?? law, $p = K_{H}x$
or $K_{H} = \frac{p_{H_2S}}{x_{H_2S}}= \frac{0.987}{0.0035}$
$= 282\,$bar
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Concepts Used:
Solutions
A solution is a homogeneous mixture of two or more components in which the particle size is smaller than 1 nm.
For example, salt and sugar is a good illustration of a solution. A solution can be categorized into several components.
Types of Solutions:
The solutions can be classified into three types:
- Solid Solutions - In these solutions, the solvent is in a Solid-state.
- Liquid Solutions- In these solutions, the solvent is in a Liquid state.
- Gaseous Solutions - In these solutions, the solvent is in a Gaseous state.
On the basis of the amount of solute dissolved in a solvent, solutions are divided into the following types:
- Unsaturated Solution- A solution in which more solute can be dissolved without raising the temperature of the solution is known as an unsaturated solution.
- Saturated Solution- A solution in which no solute can be dissolved after reaching a certain amount of temperature is known as an unsaturated saturated solution.
- Supersaturated Solution- A solution that contains more solute than the maximum amount at a certain temperature is known as a supersaturated solution.