wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

Temporary hardness is due to bicarbonates of Mg2+ and Ca2+. It is removed by addition of CaO as follows: Ca(HCO3)2+CaO2CaCO3+H2O Mass of CaO required to precipitate 2 g CaCO3

A
2 g
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
0.56 g
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
0.28 g
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
1.12 g
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is B 0.56 g
mole of CaCO3=2100=0.02

From stoichiometry,
1 mole of CaO is required to precipitate 2 moles of CaCO3 and hence moles of CaO required to precipitate 0.02 mole of CaCO3
= 12×0.02=0.01
so mass of CaO =0.01×56=0.56g

flag
Suggest Corrections
thumbs-up
4
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Water - Hardness and Treatment
CHEMISTRY
Watch in App
Join BYJU'S Learning Program
CrossIcon