Upon prolonged exposure to dry air, one formula unit of washing soda () loses exactly molecules of w — s Block Elements Chemistry Question

💡 Solution & Explanation

Washing soda ($Na_2CO_3 \cdot 10H_2O$) undergoes efflorescence in dry air, losing 9 molecules of water to form the stable monohydrate ($Na_2CO_3 \cdot H_2O$). Thus, exactly 9 molecules of water are lost.