Use the solubility rules (Table 4.1) to decide which of the following compounds are expected to be soluble and which insoluble.

a. Mg(C₂H₃O₂)₂ 

b. NiS 

c. Cr(NO₃)₂ 

d. Ca₃(PO₄)₂

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Table 4.1 Solubility Rules for lonic Compounds Rule Applies to Statement Exceptions Lit, Na*, K*, NH," Group 1A and ammonium compounds are soluble. 1 C,H;O,, NO,- Acetates and nitrates are soluble. 3 CI", Br", I- Most chlorides, bromides, and AgCl, Hg,Cl,, PbCl,, AgBr, HgBr, Hg,Br2, PbBr,, AgI, Hgl, Hg,I, PbI, iodides are soluble. SO,?- CaSO4, SrSO4, BaSO4, Ag,SO4, Hg,SO4, PBSO4 4 Most sulfates are soluble. 5 CO,?- Most carbonates are insoluble. Group 1A carbonates, (NH4),CO; 6 PO,- Most phosphates are insoluble. Group 1A phosphates, (NH4),PO4 7 S2- Most sulfides are insoluble. Group 1A sulfides, (NH,),S 8 OH- Most hydroxides are insoluble. Group 1A hydroxides, Ca(OH),, Sr(ОH)2, Ba(ОН).