What can be done to correct the pressure, if a gas is collected over water?

Adding the vapor pressure of water

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Subtracting the vapor pressure of water at that temperature

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Multiplying by the vapor pressure of water

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Subtracting the temperature of the water from the vapor pressure

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Solution

The correct option is C Subtracting the vapor pressure of water at that temperature
If a gas is collected over water, the pressure of the gas is corrected by subtracting the vapor pressure of water at that temperature.
$P_{T} = P_{1} + P_{2}$
$P_{T} =$ total pressure over water
$P_{1} =$ the vapor pressure of water at that temperature
$P_{2} =$ the pressure of the gas
$P_{2} = P_{T} - P_{1}$

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