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Consider a solution of CO ₂( ~g ) dissolved in water in a closed container. Which one of the following plots correctly represents variation of log (partial pressure of CO ₂ in vapour phase above water) [y -axis] with (mole fraction of CO ₂ in water) [x -axis ] at 25^ C ?

Correct answer

1

Step-by-step solution

According to Henry's Law, the partial pressure of a gas in the vapour phase ( p ) is proportional to the mole fraction of the gas in the solution ( x ). The mathematical expression is: p = K_H x where K_H is the Henry's law constant. Taking logarithm on both sides: (p) = (K_H x) (p) = (K_H) + (x) Comparing this with the equation of a straight line y = mx + c : y = (p) (y-axis) x = (x) (x-axis) m = 1 (slope) c = (K_H) (y-intercept) Since K_H for CO₂ in water is a positive constant at 25^ C , (K_H) will be a constant

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