Question

DAU COROANA SI 60 PUNCTE

Answer 1

1.

md= 50 g , m.apa = 450 g

ms = md+m.apa = 50+450 = 500 g sol. NaOH

w% = mdx100/ms = 50x100/500 = 10%

2.

ms = 500 g , w%= 4%

w%= mdx100/ms

=> md= msxw%/100 = 500x4/100 = 20 g CaCO3

20g                                                    V L

CaCO3 + 2HCl --> CaCl2 + H2O + CO2

100                                                    22,4

=> V = 20x22,4/100 = 4,48 L CO2 in c.n.