H2S , a toxic gas with rotten egg like s...

`H_2S` , a toxic gas with rotten egg like smell, is used for the qualitative analysis. If the solubility of `H_2S` in water at STP is 0.195 m, calculate Henry's law constant

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Solubility of `H_2S` gas = 0.195 m i.e., 0.195 mole in 1 kg of the solvent (water)
1 kg of the solvent (water) = 1000 g = 1000/18g = 55.55 moles
` therefore ` Mole fraction of `H_2S` gas in the solution (x) = `(0.195)/(0.195 + 55.55) = 0.0035`
Pressure at STP = 0.987 bar
Applying Henry.s law,
`p_(H_2S) = K_H xx x_(H_2S) " or " K_H = (p_(H_2S))/(x_(H_2S)) = (0.987 bar)/(0.0035) = 282 bar `

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H_(2)S gas is used in qualitative analysis of inorganic cations. Its solubility in water at STP is 0.195 mol Kg^(-1) .Thus, Henry's law constant (in atm mola l^(-1) )for H_(2)S is

`2.628xx10^(-4)`

`5.128`

`0.185`

`3.826xx10^(3)`

H_2 S is used for precipitation of cations of

2nd group

2nd and 4th group

3rd and 4th group

4th and 5th group

When SO_2 is passed through a solution of H_2 S in water :

Sulphuric acid is formed

A clear solution is formed

Sulphur acid is precipitated

No change is observed