Q. Polyphosphates are used as water softening agents because they
A) Form soluble complexes with anionic species
B) Precipitate anionic species
C) Precipitate cationic species
D) Form soluble complexes with cationic species
Explanation
(d)
Polyphosphates like sodium hexametaphosphates, sodium tripolyphosphate or STPP) form soluble complexes with ${Ca}^{2 +},\ {Mg}^{2 +}$ present in hard water
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.