Henry's Law
Henry's Law states that when a liquid and a gas are in equilibrium, the
amount of gas in solution is directly proportional to the
parital pressure of the gas, provided the temperature is constant.
That is:
[g] = A * ag * Pg
when T remains constant,
where:
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g is a gas
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[g] = the concentration of gas g in solution
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A = a constant that depends on the units used.
If you measure pressure in mmHg, then A = 0.132
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ag = a constant called the Bunsen solubility coefficient. It will be
different for each gas g.
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Pg = the pressure of gas g.
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T = the temperature of gas g.