Question

Se amesteca 200g solutie de hidroxid de potasiu de concentratie procentuala masica 20%cu 100g solutie de hidroxid de potasiu,de concentratie procentuala masica 10% si cu 100g apa
Urgent va rog!!!

Answer 1

c% = mdx100/ms

ms1 = 200g ,c1 = 20%

md1 = ms1xc1/100

= 200x20/100 = 40 g

ms2 = 100g ,c1 = 10%

md2 = ms2xc2/100

= 100x10/100 = 10 g

md.tot = md1+md2 = 50 g

ms.tot = ms1+ms2+m.apa

= 200+100+100 = 400 g

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

= 50x100/400 = 12,5%