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PLease Answer all parts of the following: a) The recommended daily allowance of calcium for men...

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Chemistry

PLease Answer all parts of the following:

a) The recommended daily allowance of calcium for men betweenthe ages of 19 to 50 is 1 000 mg Ca. Three multivitamin tablets areanalyzed for calcium gravimetrically with the precipitation ofcalcium cation by oxalate anion. If the mass dry calcium oxalateobtained is 2.0136 g, how many tablets must a man take in a givenday to meet the recommended daily allowance? Ca2+(aq) + C2O42−(aq) ==> CaC2O4 (s)

b) Aqueous lead precipitates whenmixed with aqueous carbonate.

Pb2+(aq)+ CO32−(aq) ==> PbCO3(s)

If 5.000 gPb(NO3)2and 2.500 g Na2CO3are mixed in water, which ion is the limitingreactant? What mass PbCO3is precipitated?(PbCO3= 267.21g/mol, Pb(NO3)2= 331.2 g/mol, Na2CO3= 105.9888 g/mol)

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