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Calculati masa unei substante apoase de soda caustica de concentratie 20% ce contine 200g apa

Răspuns :

Se cere ; masa SOLUTIEI apoase de.....?????
c= mdx1oo/ms= mdx100/ (md+mapa)
20/100= md/ md+200----->20md+4000=100md --> md=5og- soda caustica
--> ms= 200g apa  50g soda caustica