# H2S, a toxic gas with rotten egg like smell is used for the qualitative analysis. 1f the solubility of H2S in water at STP is 0.195 m.

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H2S, a toxic gas with rotten egg like smell is used for the qualitative analysis. 1f the solubility of H2S in water at STP is 0.195 m. Calculate Henrvs law constant.

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Solubility of H2S gas = 0.195 m

= 0.195 mole in 1 kg of the Solvent (water)

1 kg of the solvent (water) = 1000 g = $\frac{1000\,g}{18\,g\,mol^{-1}}$ = 55.55 moles

Mole fraction of H2S gas in the solution (x) = $\frac{0.195}{0.195+55.55}$ = 0.0035

Pressure at STP = 0.98 7 bar

Applying Henry’s law

$P_{H_2S}=K_H\times x_{H_2S}$