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200g. - 100%
x - 5%
x= 200*5÷100=10
200g.-10g.= 190g
Odp. Trzeba użyć 190g. wody i 10g KOH
Zadanie 4
50g. -100%
x - 2%
x= 50*2÷100=1
100g - 100%
1g. - x
x=1*100÷100=1
Odp. Stężenie wynosi 1%