Question

Peste 400 gr solutie de concentrație 5% se adauga 100 gr zahar .Calculati cp solutie finale ?​

Answer 1

ms1 = 400 g , c1% = 5%

md2 = 100 g

stim ca c% = mdx100/ms

=> md1 = ms1xc1%/100

= 400x5/100 = 20 g

md.tot = md1 + md2 = 20+100 = 120 g

ms.fin = ms1+md2 = 400+100 = 500 g

=> c.f.% = md.totx100/ms.fin

= 120x100/500 = 24%