100% VERIFIED WAEC GCE CHEMISTRY PRACTICAL ESSAY AND OBJ ANSWER

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1a) i) Mass concentration of B=3.95/750*1000 =5.2g/dm VA=22.70cm^3 VB=25.0cm^3 ii) Concentration of B in mol/dm^3 =Concentration in g/dm^3/Molar mass in g/mol Molar mass of Na2CO3 =(23*2)+(12)+(16*3) =46+12+48 =106g/mol Concentration in mol/ dm^3=5.27/106 =0.0497mol/dm^3 iii) CAVA/CBVB=nA/nB (CA*22.70)/(0.0497*25)=1/1 CA=(0.0497*25*1)/22.70*1) CA=0.0548mol/dm^3 iv) CA=concentration in g/dm/molar mass Molar mass of A=H2SO4 =(1*2)+32+(16*4) =2+32+64 =98g/mol 0.0548=concentration in g/dm^3/98 Concentration of A in g/ dm^3=0.0548*98 =5.37g/dm^3 (1b) 0.0548=mole/1 mole=0.0548mol 0.0548=x/6.02*10^23 x=0.0548*6.02*10^23 x=3.3*10^22 (1c) Methyl orange: This is because it is between strong acid and weak base (2) (a)Inference: C is a soluble salt (bi) Observation: A gas with irritating smell is formed (bii) Observation: A dense white fume of NH4Cl is formed (c)Observation:-Soluble in excess (d)Observation: A gas that turns lime water milky and red litmus paper to blue (ei) Inference: Ca^2a+ -present (eii) Observation: White precipitate is formed,insoluble (fi) Filtrate->CaSO4 (fii) residue->CaCO3. (3ai) Q->H2 R->CuO X->H2O Y->Cu (3aii) Blue to Black (3aiii) X is serves as cooling (3b) -Ammonia -Hydrogen sulphide -Chlorine -Ammonia -Bromine (3c) -To measure a known volume of gas -To keep clean substance -To deliver a substance -To keep a substance dry ====completed====