A) form soluble complexes anionic species
B) precipitate anionic species
C) from soluble complexes with cationic species
D) precipitate cationic species
Correct Answer: C
Solution :
[c] Polyphosphates are used as water softening agent because they form soluble complexes with cationic species. \[2MC{{l}_{2}}+N{{a}_{2}}[N{{a}_{4}}{{(P{{O}_{3}})}_{6}}]\to N{{a}_{2}}[{{M}_{2}}{{(P{{O}_{3}})}_{6}}]+4NaCl\]| \[(M=Ca\,\,or\,\,Mg)\] | \[(M=Ca\,\,or\,\,Mg)\] |
| From hard water | Complex salt soluble |
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