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NECO CHEMISTRY PRACTICAL ANSWERS NUMBER 1 ANOTHER VERSION *(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=40g/mol From; conc(g/dm³)=conc(mol/dm³)*molar mass =0.1*40 =4.0g/dm³ *(1biv)* Mass of salt formed =? Recall mole of NaHSO⁴=? From; mole =con(mol/dm³)*vol(cm³)/1000 Mole=0.106*23.50/1000 Mole=0.0025mol of NaHSO⁴ By proportion 1mol of NaHSO⁴ produce 1mol of Na²SO⁴ 0.0025mol of NaHSO⁴ will produce X mol of Na²SO⁴ X=0.0025*1=0.0025mol of NaSO⁴ Molar mass of Na²SO⁴=(23*2) + 32 + (16*4) =46+32+64 =142g/mol Recall; mole =mole/molar mass Mass =mole * molar mass Mass =0.0025*142 Mass =0.36g of Na²SO⁴ ==================================== [27/06, 9:34 pm] null: NECO CHEMISTRY PRACTICAL NUMBER 2 *(2a)* TEST C + 5cm³ of distilled water OBSERVATION It dissolve completely INTERFERENCE C is a soluble salt *(2bi)* TEST Solution + NaOH + Heat OBSERVATION Effervescence occurs in which a colourless gas with pungent smell and turns red litmus paper to blue is given off. INFERENCES NH³ gas from NH⁴+ is present *(2bii)* TEST Stirring rod of HCL + gas given off OBSERVATION a gas which gives a pop sound is given off INFERENCES H² is present *(2ci)* TEST Solution C + drops of BaCL² OBSERVATION a white precipitate is formed INFERENCES CO²^-3, SO²^-4, SO²^-3, May be present. *(2cii)* TEST Solution in C(i) + dil HCL OBSERVATION the white precipitate dissolve is dil HCL and effervescence occurs in which a colourless and odourless gas which turns blue litmus red and lime water milky is given off INTERFERENCE CO² gas from CO²^3- confirmed ==================================== [27/06, 9:41 pm] null: NECO 2025 CHEMISTRY PRACTICAL ANSWERS NUMBER 3 *(3a)* (i)Ca²+ (ii)Pb²+ (3bi) concentrated acid can be defined as an acid formed when a large quantity of an acid dissolve in a small or little volume of water. *(3bii)* A strong acid is defined as a type of acid that ionize completely in a solution *(3c)* Activated charcoal is used as an adsorbent material *(3d)* (i)Reddish - Brown (ii) I - red, II - brown. ==================================== Completed!

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