Question

prepare a project...
The students of class X went to the Chemistry Laboratory of nearby school. They saw

different chemical used in the laboratory. They were very much interested to know the

uses of different chemicals. They have collected the following chemicals.

NaHCO3

, Na2

CO3

, CaOCl2

, CaSO4

. ½H2

O, HCl, NaOH

(i) Name the reaction when HCl and NaOH combined.

(ii) What is the use of Na2

CO3

?

(iii) Which one is strong acid and strong base?

(iv) What is the use of NaHCO3

?

(v) What is the use of CaSO4

. ½ H2

O?

(vi) What is the use of CaOCl2

?

Answer 1

1). NaOH +HCl ---------> NaCl+ H2O
2).it is used as cleaning agent.
3). strong acid =HCl , strong base = NaOH
4).it is used in making baking powder.
5).it is used in making toys.
6).it is used in disinfecting drinking water supply .