Răspuns:
Explicație:
ms HCl= 400g
c=18,25%
ms NaOH
C=20%
-se afla md sol. de HCl
md= c . ms : 100
md= 18,25 . 400 : 100=73 g HCl
-se afla masa de NaOH (md solutiei )
xg 73g
NaOH + HCl= NaCl + H2O
40g 36,5g
x= 40. 73 : 36,5 =80g NaOH (md)
-se afla ms sol. de NaOH
ms= md .100 : c
ms= 80 .100 : 20=400 g sol. NaOH
MNaOH= 23 + 16 +1=40 ------> 40g/moli
MHCl = 1+35,5=36,5-----> 36,5g/moli