Question

Calculeaza masa solutiei de hidroxid de sodiu (NaOH) cu c=20% care poate reactiona cu 29,2 g solutie Hcl de concentratie c=25%

Answer 1

Răspuns:

m HCl=ms×c/100=29,2×25/100=7,3 g HCl

HCl+NaOH=NaCl +H2O

36,5 g HCl....40 g NaOH

7,3 g HCl.....x g NaOH

x=8 g NaOH

ms=m NaOH ×100/c=8×100/20=40 g solutie