A) form soluble complexes with cationic species
B) precipitate cationic species
C) form soluble complexes with anionic species
D) precipitate anionic species
Correct Answer: A
Solution :
Sodium hexametaphosphateis a polyphosphate. It combines with cations (i.e. \[C{{a}^{2+}},M{{g}^{2+}}\]) to form soluble complexes. \[2C{{a}^{2+}}+N{{a}_{2}}\left[ N{{a}_{4}}{{(P{{O}_{3}})}_{6}} \right]\xrightarrow{{}}\underset{\text{Soluble}\,\,\text{complex}}{\mathop{4N{{a}^{+}}+N{{a}_{2}}\left[ C{{a}_{2}}{{\left( P{{O}_{3}} \right)}_{6}} \right]}}\,\]
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