Question

Out of following which salt is responsible for permanent hardness of water. A) CaCO3 , B) MgCO3 C) CaCl2 , D) MgCl2 , E) CaSO4 ​

Answer 1

Answer:

Calculate the temporary and permanent hardness of water sample having the following the following constituents per litre:

Ca(HCO

3

)

2

=162mg,MgCl

2

=95=mg,

NaCl=585mg,Mg(HCO

3

)

2

=73mg,

CaSO

4

=136mg