Question

1.Pilitura de iod este o solutie de iod in alcool cu C% de 7% .Avand 4.2 g de iod cate g de tinduri de iod putem obtine?
Ce cantitate de alcool se consuma?

2.Cate g de soda se afla in 525g de solutie de soda caustica de concentratie 12%
Ce masa de apa contine solutia?

Answer 1

1.

cred ca vrei sa spui tinctura de iod si NU Pilitura de iod

c = 7% , md = 4,2 g si c =mdx100/ms

=> ms = mdx100/c% = 4,2x100/7 = 60 g sol tinctura de iod

m.solvent = ms - md = 60 - 4,2 = 55,8 g alcool

2.

ms = 525 g , c = 12%

stim ca c = mdx100/ms

=> md = msxc/100 = 525x12/100 = 63 g soda

=> m.apa = ms - md = 525 - 63 = 462 g apa