Răspuns:
c=mdx100/ms---> m,HCl= cxms/100==36,5x150/100g=54,75g
m,apa= ms-md= 150g-54,75g=95,25g
miu,HCl= 36,5g/mol
niu,HCl= m/miu= 54,75/36,5mol=1,5mol
1,5mol---> 1,5mol.......1,5mol,,,,,,,,1,5mol
HCl + NaOH ----> NaCl + H2O
miuNaOH=40g/mol-------> m=niuxmiu-1,5x40g=60g
mapa=ms-md= 200g-60g=140g
miu apa=18g/mol------> m= 1,5x18g=27g
miu,NaCl=58,5g/mol-----> m=1,5x58,5g=87,75g=md
solutia rezultata contine 87,75g NaCl dizolvata in masa de apa care a rezultat din solutie adunata cu masele de apa de la cele doua solutii, de HCl si NaOH
m,apa= 27+ 95,25+ 140=>262,25g
ms=md+m,apa= 87,75+262,25=>350g
c=mdx100/ms= 87,75x100/350=>25%
Explicație: