(a) What is a salt ? Give the names and formulae of any two salts. Also name the acids and bases from which these salts may be obtained.
(b) What is meant by ‘a family of salts’ ? Explain with examples.
(c) What is meant by ‘hydrated’ and ‘anhydrous’ salts ? Explain with examples.
(d) Write the names, formulae and colours of any two hydrated salts.
(e) What will be the colour of litmus in an aqueous solution of ammonium chloride salt ?
Lakhmir Singh Chemistry Class 10
Answers
Answer:
Explanation:
(a) A salt is a compound that is created from an acid by a metal replacing the hydrogen in the acid.
Example: Sodium chloride – NaCl ; derived from sodium metal and hydrochloric acid.
Ammonium chloride – NH4Cl ; derived from ammonia and hydrochloric acid
(b) The salts having the same positive ions belong to the family of salts. Example: Sodium sulphate and sodium chloride both belong to the same family of salts known as the sodium salts.
(c) The salts containing water of crystallization are known as the hydrated salts.
Example: Copper sulphate crystals consist of five molecules of water of crystallization. The salts that have lost water of crystallization are called anhydrous salts.
Example: When copper sulphate is strongly heated, the crystals lose all the water of crystallization and form an anhydrous copper sulphate.
(d) Copper sulphate pentahydrate salt has the chemical formula - CuSO5H O and is blue in colour. Iron sulphate heptahydrate salt has the chemical formula is FeSO4 .7H2O and is green in colour.
(e) The aqueous solution will turn the blue litmus into red.
nacl2
Explanation:
are common salt ised at home purpose