Question

Calculați

A).

md=?
ms=1600 sol.
C%=25%

B).

C%=?
md=120NaOH
m H2O=0,48 m3 H2O
P H2O =1g/cm3

Answer 1

a)

stim ca c% = mdx100/ms

=> md = msxc%/100

= 1600x25/100 = 400 g sol

b)

V.apa  = 0,48 m3 = 0,48 kg = 480 g apa

stim ca ms = md+m.apa = 120 + 480 = 600 g sol.

aplicam c% = mdx100/ms

= 120x100/600 = 20%