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A PO43- in 100 ml water sample is precipitated as Ag3PO4 by adding 200 ml 0.2 M AgNO3. Then excess AgNO3 is back-titrated with 100

A PO43- in 100 ml water sample is precipitated as Ag3PO4 by adding 200 ml 0.2 M AgNO3. Then excess AgNO3 is back-titrated with 100 ml 0.2 M KSCN. What is the molar analytical concentration of PO43- in sample?

Chemical reactions are as follows:

PO43- + 3Ag+ ⟶ Ag3PO4(s)

Ag+ + SCN- ⟶ AgSCN(s)

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