NECO 2013 Chemistry Specimens Summary Question And Answers for Salt Analysis NECO 2013 Chemistry Specimen Summary Question And Answers for Salt Analysis 1) TEST=C+H2O OBSERVATION= C is partially soluble filterate residue is black INFERENCE= no inference 2) TEST= filterate + NaOH in drops in excess OBSERVATION= (for in drops) gellatinuous white ppt (for in excess) ppt is soluble INFERENCE= (for in drops)- Ca^+,Pb^2+,Al^3 +,Zn^2+ (for in excess)- Pb^2+,Al^3+,Zn^ 2+ 3) TEST= filterate + NH3 in drops in excess OBSERVATION= (for in drops)- white gelatinuous ppt (for in excess)- ppt is soluble INFERENCE= (for in drops)- Pb^2+,Al^3+,Zn^ 2+ (for in excess)-Zn^2+ 4) TEST= (L1) filterate + BaCl2 (L2) + dil. HCl OBSERVATION= (for L1 in no. 4)- white ppt (for L2 in no. 4)- ppt is soluble INFERENCE= (for L1 in no. 4)- SO4^2- or SO3^2- (for L2 in no. 4)- SO4^2- 5) TEST= residue + dil. HCl OBSERVATION= residue dissolves to form a blue solution INFERENCE= no inference 6) TEST= solution of residues + NaOH in drops in excess OBSERVATION= (for in drops)- blue ppt (for in excess)- ppt insoluble INFERENCE= (for in drops)- Cu^2+ (for in excess)- Cu^2+ 7) TEST= solution of residues + NH3 in drops in excess OBSERVATION= (for in drops)- blue ppt (for in excess)- ppt dissolves to form a deep blue solution INFERENCE= (for in drops)- Cu^2+ (for in excess)- Cu^2+ NOTE=any where you see in drops, in excess, L1 for no. 4, L2 for no. 4 and so on it
Posted on: Thu, 13 Jun 2013 09:24:08 +0000
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