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Cp - stężenie procentowe
ms - masa substancji - Ba(OH)₂
mr -masa roztworu
mr = mw + ms
m w - masa wody
Cp = (ms*100%):(ms + mw)
Cp = 2%
mw = 100g
2%=(ms*100%):(100g+ms) /*(100g+ms)
2%*(100g+ms) = ms*100%/ :%
200g+2*ms = 100*ms
100*ms-2*ms = 200g
98*ms = 200g
ms = 2,04 g Ba(OH)₂