Subject:- Applied Chemistry 2.

Topic:- Fuels.

Difficulty:- Medium

Given: Given: Weight of coal sample = 1.56 gm NaOH consumed = 6.25 ml Normality of H2SO4 and NaOH = 0.1N Quantity of H2SO4 used = 50ml Amount of H2SO4 used = (50-6.25) =43.75 ml N% = Volume of acid consumed x Normality of acid
x1.4/weight of coal sample =43.75 x0.1x1.4/1.56 N% = 3.93 % Calculations of % of sulphur Weight of BaSO4 formed = 0.1755gm S% = wt. of BaSO4 formed /wt. of coal x32/235x100 =0.1755/2.60x32/233 x 100 S% =0.93%