Chemistry
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
Acids Bases Salts
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Answer
(a) Increase
(b) Increase
(c) Decrease
(d) Increase
(e) Increase
Explanation — Efflorescent substances lose their weight while hygroscopic and deliquescent substances gain weight when exposed to atmosphere. Solid NaOH, Solid CaCl2 and Iron (III) Chloride (FeCl3) are deliquescent substances while Conc. Sulphuric acid is hygroscopic hence they gain weight when exposed to air. Solid Na2CO3.10H2O is an efflorescent substance hence it loses weight.
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