H2S 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 molal-1) for H2S is
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a
2.628×10-4
b
5.128
c
0.185
d
3.826×103
answer is B.
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Detailed Solution
By Henry's law, p=KH χ=KH S (where, S = solubility) ∴KH=pS=1 atm0.195 mol kg-1 =5.128 atm kg mol-1