Question

se amestecă doua solutii. O solutie are masa 200g si concentratia procentuala 20%, cea de-a doua solutie conține 10g de sare si are concentratia 10%. Aflati concentratia solutiei finale​

Answer 1

md 1 = 200g
C = 20 %
md 2 = 10 g NaCl
C= 10%
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ms 1,2 = ? Cf = ?
C = md / ms * 100
20 = 200/ ms * 100
ms 1 = 200*100 / 20
ms 1 = 1000 g
C = md / ms * 100
10 = 10 / ms * 100
ms 2 = 10 * 100 / 10
ms 2 = 100 g
Msf = ms1 + ms2
Msf = 1000 + 100
Msf = 1100 g
Mdf = md1 + md2
Mdf = 200 + 10
Mdf = 210
Cf = 210* 100 / 1100
Cf = 19,09 %