Question

Calculati masa de solutie de hidroxid de sodiu de concentratie 20% care reactioneaza cu 220 g dioxid de carbon ? ​

Answer 1

Răspuns:

n CO2 = m / M = 5 moli CO2

2 1

2NaOH + CO2 = Na2CO3 + H2O

x 5

1 mol CO2 ........... 2 moli NaOH

5 moli CO2 .......... x

=> x = 10 moli NaOH

m NaOH = 10*40 = 400g NaOH

msol NaOH = md/c% * 100 = 400/20*100 = 2000g solutie NaOH c% = 20%