Question

5. Ce volum de ape este necesar pt. a prepare
a) t solutie de 8% din 6 sare
b)solutie de 5% din 200g sare
c)solutre de 10% din 50g sare?​

Answer 1

Răspuns:

apa are densitatea 1g/ml, deci daca calculez masa ,voi stii volumul

c= mdx100/ms   unde ms= md+m,apa

md=6g

c=8%

ms=mdx100/c= 6x100/8g=75g

m,apa= ms-md= 75g-6g= 69g----> v= 69ml

md=200g

c=5%

ms= 200x100/5g= 4000g

m,apa=4000g-200g=3800g----> v= 3800ml

md=50g

c=10%

ms= 50x100/10g= 500g

m,apa=500g-50g= 450g----> v= 450ml

Explicație: