23. When dilute hydrochloric acid is added to a sodium compound A, then brisk effervescence
of a gas B is produced. On passing this gas through lime-water, the lime-water turns milky
forming an insoluble compound C. When excess of gas is passed, the insoluble compound
dissolves forming a soluble compound D.
(a) What could be compound A?
(b) Name the gas B.
(c) Name the insoluble compound C.
(d) Name the soluble compound D.
Answers
Answer:
when dilute Hydrochloric acid is added to sodium then it forms NaCl that is common salt and the gas that is passed in lime water is carbon dioxide that turns it milky
ANSWER:
Compound A is Sodium bicarbonate. Gas B is Carbon Dioxide. Insoluble compound C is Calcium Carbonate. Soluble compound D is Calcium Bicarbonate.
EXPLANATION:
When dilute hydrochloric acid is added to sodium bicarbonate, it produces Carbon dioxide. When carbon dioxide is passed through lime water, which is calcium hydroxide, it reacts and forms calcium carbonate which insoluble in water.
This gives the lime water a milky appearance. When excess of carbon dioxide gas is passed then another reaction takes place and calcium bicarbonate is produced which is soluble in water. As a result the milky appearance disappears.