Question

Buna seara!Va rog sa ma ajutati la cele doua exercitii!Mulțumesc!

Answer 1

NaOH + HCl ---> NaCl + H2O.

c NaOH = md NaOH/ms NaOH * 100=>md NaOH = 200*40/100=80 g NaOH.

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

80 g NaOH..........x g HCl.        x = 73 g HCl = md.

ms HCl = md HCl/c HCl * 100 = 73/36.5*100=200 g soluție.

ms final = 200+200=400 g.

md final = 80 + 73 = 153 g.

c% finală = 153/400*100=>c%=38.25%.