Question

2 Sode and lime are added tossatith in the form of soda ash (NaZCo) and Vive stone Caco) During heating, these two ingredients decompose to give olf carton dioside (CO21 the resulting products being soda and ie Compute the weight of soda ash and mestone that mvst be added to 125 im of qart (02) to ield a glass of composition Na20, and 5 wt% CaO

Answer 1

Wt% of SiO2 in glass = 78%

Mass of glass = 125 lbm / 0.75 = 160.256 lbm

Mass of Na2O = 0.15 x 160.256 = 24.0384 lbm

Mass of CaO = 160.256 x 0.10 = 16.0256 lbm

Part a

Mass of Na2CO3

= mass of Na2O x molecular weight of Na2CO3 / molecular weight of Na2O

= 24.0384 lbm x (105.99 g/mol / 61.98 g/mol)

= 41.107 lbm

Part b

Mass of CaCO3

= mass of CaO x molecular weight of CaCO3 / molecular weight of CaO

= 16.0256 kg x (100.09 g/mol / 56.08 g/mol)

= 28.602 lbm