Question

SE AMESTECA 200 GR SOLUTIE ACID CLORHIDRIC 10% CU 600GR ACID CLOHIDRIC 20%. CALCULEAZA CONCENTRATIA PROCENTUALA A SOLUTII OBTINYTE PRIN AMESTECAREA CELOR 2 SOLUTII EXTREM DE URGENT VA ROOOGGGGGG

Answer 1

c = mdx100/ms

ms1 = 200 g

c1 = 10%

=> md1 = ms1xc1/100 = 200x10/100 = 20 g

ms2 = 600 g

c2 = 20%

=> md2 = ms2xc2/100 = 600x20/100 = 120 g

=> md.fin = md1 + md2 = 20 + 120 = 140 g

ms.fin = ms1 + ms2 = 600 + 200 = 800 g

=> c.fin = 140x100/800 = 17,5%