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Roztwór 12-procentowy:
Cp = 12%
m[r] = 56g
56g --- 100%
x g --- 12%
x = (56g * 12%) : 100% = 6,72 g <--- m[s]
Roztwór 17-procentowy:
Cp = 17%
m[s] = 6,72g + x
m[r] = 56g + x
56g + x ---- 100%
6,72g + x ---- 17%
(56 + x) * 17 = (6,72 + x) * 100
952 + 17x = 672 + 100x
83x = 280
x ≈ 3,37 g <---- tyle jodku litu należy dodać