Question

830 grame solutie de carbonat de sodiu concentratie 10% se trateaza cu solutie de acid clorhidric de concentratie 5%. Ce masa de solutie de acid clorhidric s-a consumat si ce masa au produsii de reactie? (ANa=23 ; Ac=12 ; Ao= 16 ; Ah=1)

Answer 1

sol. Na2CO3 are ms = 830 g si c% = 10%, stim c% = md x 100 / ms

=> md = ms x c% / 100 = 830 x 10 /100 = 83 g Na2CO3

83 g.............. md ........... a g ....... b g ....... d g

Na2CO3  +  2HCl  =>  2NaCl  +  H2O  +  CO2

106 ...............2x36.5 .....2x58,5.....18.............44

=> md = 83x2x36,5/106 = 57,16 g HCl

=> ms = mdx100/c% = 57,16x100/5 = 1143,2 g sol HCl

=> a = 83x2x36,5/106 = 91,61 g NaCl

=> b = 83x18/106 = 14,09 g H2O

=> d = 83x44/106 = 34,45 g CO2