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Question

At what relative humidities will Na2SO410H2O be efflorescent (release moisture) when exposed to air at 0C?

A
Above 33.33%
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B
Below 33.33%
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C
Above 66.66%
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D
Below 66.66%
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Solution

The correct option is B Below 33.33%
The vapour pressure of water is 0.00605 atm at 0C.
When relative humidity is 33.33% the partial pressure of water is 0.002 atm.
When relative humidity is lower than this, Na2SO410H2O will release moisture.

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