WAEC GCE Chemistry Practical Solution Questions and Answer – NOV/DEC 2018 Expo Runz. Note Subscribers Get it First Before Others 2) Test I. Solution + NaOH in excess Ii. Solution + NH3 in excess Iii. Solution + BaCl + HCl in excess Iv. Solution + AgNO3 Observation I. White gelatinous precipitate soluble in excess NaOH Ii. White gelatinous precipitate soluble in excess NH3 Iii. White precipitate formed with BaCl2 which dissolves in excess HCl iv. White precipitate formed with AgNO3 1ai) Burrette readings/cm3:|titre 1|titre2|titre3 Final readings |33.20 |49.60 |1.50 Initial readings |16.40 |16.40 |16.65 1aii) Average volume of acid used = 16.40+16.40+16.65(cm3)/3 =49.45cm3/3 =16.48cm3 1b) i) Concentration of Y(OH)2.XH2O in mol/dm3 Using CAVA/CBVB = a/b CA= 0.025mol/0.25dm3 = 0.1mol VA = 16.48cm3 CB = ? VB = 25.00cm3 a = 1mol b = 2 moles .:. CAVA/CBVB =a/b CB = CAVA*B/VB*a = 0.1 mol/dm3 * 16.48cm3 * 2 moles / 25.00 * 1 mol CB = 3.296/25 CB = 0.131mol/dm3 3a) i)Desiccator- use for preservi...