Question

State your observations when

(a) Washing soda crystals

(b) Iron (III) chloride salts are exposed to atmosphere.

Answer 1

i) When washing soda (Na2CO3
.10H2O) are exposed to air, they lose nine molecules of water of
crystallization and form a monohydrate.
Na2CO3
.10H2O --> Na2CO3
.H2O +9H2O


ii) It absorbs moisture from the atmosphere to become moist and ultimately dissolves in the absorbed
water, forming a saturated solution.