Question

in 400 g solutie de acid sulfuric 10 la suta se toarna 100 g acid sulfuric pur .Care este concentratia procentuala a solutiei obtinute

Answer 1

masa de acid pur se adauga atat la masa dizolvata,md, cat si la masa solutiei, ms.

ms1=400g
c1=10%
c1= md1x100/ms1---> md1=10x400/100= >40g H2SO4 pur

md2=md1+100=> 140g 
ms2= ms1+100=>500g

c2= 140x100/500=..................calculeaza !!