State whether a sample of each of the following would increase or decrease in mass if exposed to air.
State whether a sample of each of the following would increase or decrease in mass if exposed to air.

(a) Solid NaOH (b) Solid CaCl2

(c) Solid Na2CO3.10H2O (d) Conc. sulphuric acid

(e) Iron (III) chloride

Answers:

(a) Solid NaOH – Increases in mass when exposed to air.

(b) Solid CaCl2– Increase in mass when exposed to air.

(c) Solid Na2CO3.10H2ODecrease in mass when exposed to air.

(d) Conc. sulphuric acid – Increase in mass when exposed to air.

(e) Iron (III) chloride – Increase in mass when exposed to air.