Question

Determinati m(g) de solutie HCl 20% care neutralizeaza complet 100 mL solutie NaOH cu concentratia molara de 10^-1 mol/L.

Answer 1

ms = ?
C = 20%

Vs = 100mL NaOH
C = 0,1M

C = n/Vs => n =C*Vs = 0,1*0,1 = 0,01 moli NaOH

NaOH + HCl => NaCl + H2O

n NaOH = nHCl = 0,01 moli

md HCl = 0,01*36,5 = 0,365g

C = md/ms*100 => ms = md*100/C = 36,5/20 = 1,825g sol. HCl

Answer 2

Ai si rezolvarea mea in poza. 
Sper sa intelegi. Daca nu,astept intrebari :)