Salt analysis of Ag salts

Question

So I was doing analysis of silver salts and I found $ce{AgBr}$ is curry white partially soluble in ammonia, $ce{AgI}$ is yellowish and insoluble but silver phosphate is also yellow. So can anyone tell whether or is soluble in ammonia or not?

Nilay Ghosh · Answer

According to Firsching [1],

silver phosphate is indeed soluble in ammoniacal solution due to formation of silver-ammonia complex.

The following is the solubility data of $ce{Ag3PO4}$ in $ce{NH4OH}$ at $pu{35.5 °C}$ presented by Saraswat [2]:
begin{array}{rr}
hline
c(ce{NH4OH})/ & c(ce{Ag3PO4})/ \
pu{mmol l^-1} & pu{mmol l^-1} \
hline
0 & 0 \
4.05 & 0.133 \
8.09 & 0.265 \
16.18 & 0.531 \
32.36 & 1.061 \
64.72 & 2.057 \
129.45 & 4.113 \
258.90 & 8.292 \
517.80 & 26.478 \
hline
end{array}
References

Firsching, F. H. Precipitation of Silver Phosphate from Homogenous Solution. Anal. Chem. 1961, 33 (7), 873–874. DOI: 10.1021/ac60175a018.
Saraswat, H. C. Formula of Complex Compounds from Solubility Data. Proc. Indian Acad. Sci. (Math. Sci.) 1949, 30 (6), 329–332. DOI: 10.1007/BF03048752.

Salt analysis of Ag salts

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References

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