Zmieszano 150 g 4-procentowego roztworu z 250 g 10-procentowego rztworu tej samej substancji.Oblicz stężenie procentowe otrzymanego roztworu.

Cp1 = 4% Cp2 = 10% Cp3 = ? Ms1 = 0,04 * 150g = 6g Ms2 = 0,1 * 250g = 25g Ms3 = 6g + 25g = 31g Mr1 = 150g Mr2 = 250g Mr3 = 150g + 250g = 400g Cp3 = 31g * 100% / 400g = 7,75%

Dane: Szukane: mr1=150g. C%3=? C%1=4% mr2=250g C%2=10% c%3=ms3/mr3 * 100% ms1=C%1*mr1 ms1=4% * 150g= 4/100 * 150 g= 6g ms2=C%2 * mr2 ms2= 10% * 250g= 10/100 * 250g = 25g. mr3= 250g + 150g = 400g. ms3= 6 g+ 25 g = 31g C% = 31g/400g * 100% = 8% c%3 = 8%