50 ml = 5 cl = 0.5 dl = 0.05 l
0.05 l = 0.05 dm3 = 50 cm3 solutie
Folosind formula densitatii:
[tex]\rho = \frac{m}{v} =\ \textgreater \ m = \rho * v =\ \textgreater \ m = 1 \frac{g}{cm^3} * 50 \ cm^3 =\ \textgreater \ \\ =\ \textgreater \ m = 50 \ g[/tex]
Am aflat masa solutiei de 50 g.
Folosim formula pentru concentratia procentuala:
[tex]C = \frac{m_d}{m_s}*100[/tex]
md = 1 g KNO3
ms = 50 g
[tex]=\ \textgreater \ C = \frac{1}{50}*100=\ \textgreater \ \frac{C}{100}=\frac{1}{50} =\ \textgreater \ C = \frac{100}{50} =\ \textgreater \ \\ =\ \textgreater \ C = 2[/tex]
Concentratia procentuala a solutiei obtinute este 2%.
