13.4 Exercise 21

Sodium sulfate 10−hydrate, Na₂SO₄·10H₂O, dehydrates according to the equation

$\text{Na}_{2} \text{SO}_{4} \cdot 10 \text{H}_{2} \text{O} \left(s\right) \rightleftharpoons \text{Na}_{2} \text{SO}_{4} \left(s\right) + 10 \text{H}_{2} \text{O} \left(g\right) K_{P} = 4.08 \times 10^{−25} \text{at} 25 °\text{C}$

What is the pressure of water vapor at equilibrium with a mixture of Na₂SO₄·10H₂O and NaSO₄?