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Question: The formula of calgon is: A. \(N{a_2}[N{a_4}{(P{O_3})_6}]\) B. \(N{a_4}[N{a_2}{(P{O_3})_6}]\) ...

The formula of calgon is:
A. Na2[Na4(PO3)6]N{a_2}[N{a_4}{(P{O_3})_6}]
B. Na4[Na2(PO3)6]N{a_4}[N{a_2}{(P{O_3})_6}]
C. Na4[Na2(PO3)3]N{a_4}[N{a_2}{(P{O_3})_3}]
D. Na2[Na4(PO3)4]N{a_2}[N{a_4}{(P{O_3})_4}]

Explanation

Solution

Hint: Calgon is a market name. It is a complex compound with six phosphate ions forming a ring surrounded by sodium ions. Its chemical name is sodium hexametaphosphate.

Complete step by step solution:
Calgon is the trade name for a complex compound named sodium hexametaphosphate and its formula is (NaPO3)6{(NaP{O_3})_6}. Generally metaphosphates form ring structure. Here, we are asked for hexametaphosphate then surely, option C and D are out. Its complex form is given by Na2[Na4(PO3)6]N{a_2}[N{a_4}{(P{O_3})_6}] and thus comparing the choices, we can say that option A is the correct one.

Note: There is trimetaphosphate with three phosphate ions forming a ring. But calgon does not have them. That is why we reduced the correct option to A and B. Reading about popular compounds will help relate and remember such compounds.