Number of moles of CaO required to remove hardness from 1000 litre water having 324 ppm of calcium bicarbonate.
A
8
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
4
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
3
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
2
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution
The correct option is D2 Ca(HCO3)2+CaO→2CaCO3↓+H2O.
Molecular weight of Ca(HCO3)2=162 gms
Moles of Ca(HCO3)2=324162=2
From the reaction, it is clear that 1 mole of CaO is required for one mole of calcium bicarbonate, thus for 2 moles of calcium bicarbonate, we require 2 moles of CaO.