If the water level in the eudiometer is lower than the water level in the beaker at the end of the reaction, it means that gas has been produced during the reaction and it has displaced the water in the eudiometer. This would increase the total pressure, Pt, because the gas produced adds to the pressure exerted by the water vapor in the eudiometer. The total pressure, Pt, would be higher than if only the water vapor in the eudiometer was present.
This would also affect the calculation of the H2 (g) pressure, Ph2. In the eudiometer, the displacement of water by the gas produced means that the pressure of the gas is equal to the difference in water levels between the beaker and the eudiometer. If the water level in the eudiometer is lower, it means the gas occupies more space and therefore exerts less pressure on the water. Consequently, the calculated pressure, Ph2, would be lower than if the water level in the eudiometer was higher.
If the water level in the eudiometer is lower than the water level in the beaker at the end of the reaction, how would this affect the total pressure, Pt? How would this affect the calculation of the H2 (g) pressure, Ph2? Explain
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