Question

Va rog ma ajutați cu ex.12

Answer 1

Răspuns:

Explicație:

1 L solutie HCl...............................4,3*10^-3 moli HCl

NaOH + HCl = NaCl + H2O

4,3*10^-3 moli HCl reactioneaza cu 4,3*10^-3 moli NaOH

M NaOH = 40 g/mol

4,3*10^-3 *40 = 0,172 g NaOH

100 g solutie 10%............................10 g NaOH

x.........................................................0,172 g NaOH

x = 0,172*100/10 = 1,72 g solutie 10% NaOH