Răspuns:
Explicație:
ms HCl= 146 g , c=20%
a masa de sare
b.masa de NaOH , p=80%
-se afla md sol. de HCl
md= c . ms :100
md= 20 . 146 : 100=29,2 g HCl
-se afla masa de sare =NaCl
29,2g yg xg
HCl + NaOH = NaCl + H2O
36,5g 40g 58,5g
x= 29,2 . 58,5 : 36,5=46,8 g NaCl
n= 46,8g : 58,5g/moli=0,8 moli NaCl
-se afla masa de NaOH
Y= 29,2 . 40 : 36,5=32 g NaOH PUR
-se afla masa totala de NaOH
p= mp .100 : mi
mi =mp .100 : p
mi= 32 . 100 : 80=40g NaOH
MNaOH= 23+16 +1=40------> 40g/n=moli
M NaCl= 23 +35,5= 58,5------> 58,5g/moli
MHCl= 1+35,5= 36,5-----> 36,5g/moli