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NECO Chemistry Practical Solution Questions and Answer – June/July 2021 Expo Runz. (1a) Tabulate Volume of pipette used=25cm3. Indicator used= Methyl orange Under Titration, Rough, 1st, 2nd, 3rd, Final burette reading; |25.00| |23.40| |23.50| 23.60| Initial burette reading; |0.00| |0.00| |0.00| |0.00| Volume of A used; |25.00| |23.40| |23.50| |23.60| (1ai) Average volume of Acid used=23.40+23.50+23.60/3 =70.5/3=23.50cm3 (1aii) This is because it is a reaction between a weak acid and strong base (1aiii) A funnel should be used while transferring the acid into the burette. (1bi) Conc of A in mol|dm³ =? Conc of A in g|dm³ = 12.75g|dm³ Molar mass of A, NaHSO⁴ = 23+1+32+64 =120g|dm³ From. Conc(mol/dm³) = conc(g/dm³)/molar mass Conc =12.75/120 Conc =0.106mol/dm³ (1bii) Con of B in mol/dm³ =? Ca =0.106, Cb =? Va =23.50cm³, Vb =25.00cm³ na=1 , nb=1 From; CaVa/CbVb=na/nb Cb=CaVanb/Vbna Cb=0.106*23*50*1/25.00*1 Cb=2.5/25 Cb=0.1mol/dm³ (1biii) Conc of B in g/dm³=? Molar mass of B , NaOH=23+16+1=4...

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