Multiple choice questions. Circle your answers. A substance that loses water whe

Question

Multiple choice questions. Circle your answers. A substance that loses water when heated and also gives a residue that is water soluble is a. hygroscopic. b. a hydrate. c. a desiccant. d. deliquescent. e. efflorescent. The solid residue that remains when a hydrate is heated is a. an anhydrous salt. b. a hygroscopic compound. c. a desiccant. d. deliquescent. e. efflorescent. The anhydrous compound that will absorb water from the atmosphere is a. a hydrate. b. hygroscopic. c. deliquescent. d. a desiccant. e. efflorescent. A compound that will lose water spontaneously to the atmosphere is a. a hydrate. b. hygroscopic. c. deliquescent. d. a desiccant. e. efflorescent. What would you observe when a pea-size amount of a hydrate is heated in a test tube?

Explanation / Answer

1.b)

Hydrate is a substance that contains water upon heating yields an anhydrous salt i.e residue

2.a)

solid residue that remains when a hydrate is heated is called anhydrous species.

for example Hydrated copper sulphate upon heating gives anhydrous Copper sulphate along with water vapour.

3. d)

Some anhydrous compounds like CaCl2 and hygroscopic substances used to dry or remove water (drying agents) from the atmosphere which is used as a desiccant.

4. e)

Efflorescence means spontaneoly loses water by a hydrated salt. This takes place when vapour pressure of hydrate is greater than the partial pressure of water in the air.

5. It loses water and leaves a solid residue.

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