274. Write in ionic and molecular forms the reaction equations for the interaction of the following compounds in aqueous solutions. Specify their application in analytical chemistry.
1) BaCl2 K2Cr2O7 4) MgNH4PO4 HCl
2) Mg(OH)2 NH4Cl 5) BiI3 KI
3) CdSO4 NH4OH (ex.) 6) CrCl3 (NH4)2S

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