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Z def.stęż. procent.
10g chlorku-----100g roztworu
xg chlorku------200g roztworu
x=10*200/100
x=20g chlorku sodu
2.
Z def.stęż. procent.
20g węglanu-----100g roztworu
xg węglanu------150g roztworu
x=20*150/100
x=30g węglanu sodu