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a barium/calcium/magnesium unknown solution gave no reaction with aqueous (NH4)2SO4, however the unkown solution produced a...

a barium/calcium/magnesium unknown solution gave no reaction with aqueous (NH4)2SO4, however the unkown solution produced a white precipitate with aqueous (NH4)2C2O4, after centrifuge and decanting there was no reaction with aqueous Na2HPO4 and NaOH, state the cations present in the unkown solution

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Answer #1

So our solution contains Ba2+/ Ca2+/ Mg2+ ions.

It gives no reaction with aqueous (NH4)2SO4 so we can ruled out the presence of Sr2+.

It gives a precipitate with aqueous (NH4)2C2O4 ,this shows the presence of Ca 2+.

Ca2+ +  (NH4)2C2O4 -----------> NH4+ + CaC2O4 (s)

There was no reaction with aqueous Na2HPO4 and NaOH, this shows the absence of Mg.

If Mg is present white precipitate of Mg(NH4)PO4 will be formed by addition of aqueous Na2HPO4 and NaOH.

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