WAEC GCE Chemistry Practical Solution Questions and Answer – JAN/FEB 2019 Expo Runz.
(2) CLICK HERE FOR THE IMAGE
(1) CLICK HERE FOR THE IMAGE
H2SO4(aq) + 2NaOH(aq) —-> Na2SO4(aq) + 2H2O(l)
Volume of Acid Va = 21.60cm³
Volume of Alkali Vb = 25.0cm³
Mass of NaoH
2.0g = 500cm³
Xg = 1000cm³
X = 1000×2.0/500
X = 2×2 = 4.0g/dm³
Then mass conc = molar conc × molar mass
.:. molar conc of B = mass conc/molar mass
Where the molar mass of NaOH
=23+16+1 = 40gmol^-1
.:. Conc of NaOH in moldm^-³ = 4.0g/dm³/40g/mol
CaVa/CbVb = na/nb
Ca×21.60/0.1×25 = 1/2
Ca = 0.1×25/2×21.6
CA = 0.058mol/dm^-³
Concentration of H2SO4 in mol/dm^-³ = 0.058mol/dm-³
Recall that mass conc of H2SO4
= Molar conc × Molar mass
Where molar mass of H2SO4
= 2 + 32 + 64
Mass conc of H2SO4 = 0.058× 98
(i) I would ensure the air bubble present is removed before taking the initial reading.
(ii) I would ensure I keep my eye in level with the liquid surface while taking the burrette reading.
(iii) I would ensure there is no leakage from the burette during titration.
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