1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question A results in increase of pH of the treated water. No worries! We‘ve got your back. Try BYJU‘S free classes today! B results in reduction of pH of the treated water. Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses C may cause the increase and decrease of pH of the treated water. No worries! We‘ve got your back. Try BYJU‘S free classes today! D results in no change in pH of the treated water No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution The correct option is B results in reduction of pH of the treated water. Al2(SO4)3Alum.18H2O+3Ca(HCO3)2(Alkalinity as CaCO3)⇌2Al(OH)3(ppt↓) +6CO2(gas)+3CaSO4(permanent hardness)+18H2O The points to remember from the above equation are:
The chemistry of alum coagulation:
1. Alum reacts with alkalinity and hence decrease the alkalinity.
2. Precipitate of Al(OH)3 is formed.
3. Decrease in pH since alkalinity is reduced
4. With the formation of CaSO4, permanent hardness is induced in the water.
0
Similar questions View More
Join BYJU'S Learning Program
Related Videos
Hemiacetals and Acetals
CHEMISTRY
Watch in App
