Chemistry
State your observation when the following are exposed to the atmosphere:
(a) Washing soda crystals
(b) Iron (III) chloride salts.
Acids Bases Salts
26 Likes
Answer
(a) When washing soda (Na2CO3.10H2O) is exposed to air, it loses 9 molecules of water to form a monohydrate.
Na2CO3.10H2O Na2CO3.H2O + 9H2O
(b) When Iron (III) chloride (FeCl3) is exposed to the atmosphere at ordinary temperature, it absorbs moisture from the atmospheric air to become moist and ultimately dissolve in the absorbed water, forming a saturated solution.
Answered By
12 Likes
Related Questions
(a) Define efflorescence. Give examples.
(b) Define deliquescence. Give examples.
Answer the questions below:
(a) What name is given to the water in the compound copper sulphate-5-water?
(b) If copper sulphate-5-water is heated, anhydrous copper sulphate is formed. What is it's colour?
(c) By what means, other than heating, could you dehydrate copper sulphate-5-water and obtain anhydrous copper sulphate?
(d) Name a deliquescent salt.
(e) Why does hydrated copper sulphate turn white on heating?
Give reasons for the following:
(a) Sodium hydrogen sulphate is not an acid, but it dissolves in water to give hydrogen ions according to the equation
NaHSO4 ⇌ H+ + Na+ + SO42-
(b) Anhydrous calcium chloride is used in a desiccator.
Explain clearly how conc. H2SO4 is used as a dehydrating as well as a drying agent.