Question

Salt P commonly used in bakery products on heating gets converted into another salt Q which itself is used for removal of hardness of water and a gas R is evolved. The gas R when passed through lime water, turns it milky. Identify P, Q and R giving chemical equation for the justification of your answer

Answer 1

Explanation:

salt p is nahco3 sodium bicarbonate

salt q is na2co3 which is sodium carbonate

gas 4 is co2 because it turns limewater milky by forming caco3 i.e.calcium carbonate

equations are

nahco3 on giving heat gives na2co3 plus h2o plus co2

co2 plus ca(oh)2 gives caco3 plus h2o

on passing excess of co2

co2+h2o+caco3 gives ca(hco3)2

hope it helps

Answer 2

Answer:

NaHCO3 , Na2CO3  and CO2

Explanation:

The salt most commonly used in bakery is Sodium bicarbonate (P). On heating sodium bicarbonate, sodium carbonate is (Q) formed, which is for removal of hardness of water. The gas evolved in this process is Carbon Dioxide (R). CO2 turns freshly prepared lime water milky.

P - Sodium bicarbonate - NaHCO3

Q - Sodium carbonate - Na2CO3

R - Carbon dioxide - CO2