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Calculeaza m apa necesara pentru a dilua 20 g de solutie de amoniac de concentratie 15% pana la o C=10%

Răspuns :

ms1 =20g
c1 = 15%
c2 =10%
mapa adaugata=?

c1= md/ms1x100
md = c1xms1/100
md= 15 x20/100
md = 300/100
md = 3g amoniac
 c2 = md / ms2x100
 ms2 = mdx100/c2
ms2 = 3 x100/10
ms2 = 30g
mapaadaugata = ms2 - ms1
mapaadaugata = 30g - 20g
mapaadaugata = 10g