Question

The crystalline salt Na2CO3.xH2O on heating loses 63% of its mass and becomes anhydrous. The formula of the compound is

a. Na2CO3.2H2O
b. Na2CO3. 10H2O
c. Na2CO3. 5H2O
d. Na2CO3. 8H2O​

Answer 1

Answer:

b. Na2CO3.10H20 is the correct answer.

Explanation:

Na2CO3.10H2O become anhydrous and become Na²CO³.there is loss of 10H20.

Total mass of Na2CO3.10H20 =46+12+48+10×18=286

Mass of 10 H2O=180

loss percent=180/286×100=63%

As given in your question also.