Why does water have such a low vapor pressure?

Why is it necessary to subtract the value for water vapor pressure from atmospheric pressure to determine the pressure of the H2 gas?

  • Answer:

    The water you collect the hydrogen over has vapor pressure that will distort the equation if not accounted for. Because of the Dalton's Law of partial pressure, you know that the pressure in the test tube is from both the hydrogen and the water. To find just the hydrogen, you would have to subtract the vapor pressure of the water.

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