Question

Peste oxid de cupru (ll) se adauga 25 g solutie de acid cilindrică cu concentrarea de 36% . Calculati masa de oxid de cupru care participa la reactie .

Answer 1

        Xg       9g
       Cu O +2HCl =CuCl2 + H2O               MCuCl2=64+2.35,5=80
       80g      2.36,5                                       MHCl =1+35,5=36,5


Dintr-o solutie ,intr-o reactie chimica, reactioneaza nunai  md
c=md .100:ms

md=c.ms:100

md=36.25:100=9 g HCl


x=9.80:73=9,86 g CuO