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Call
Sodium phosphate =
Calcium nitrate =
Sodium nitrate =
Calcium phosphate =
$Na_"3"PO_"4" (aq) + Ca(NO_"3")_"2" (aq) -> NaNO_"3" (aq) + Ca_"3"(PO_"4")_"2" (s)$
States might be wrong :/
... but hope this helps :)
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