Question

Peste 50 g solutie de concentratie 15% se adauga 5 g zahar.Ce concentratie va avea solutia finala?

Answer 1

15 pe 100 ori 50... vezi cat iti da Cf: mdf ori 100 supra msf Mdf va fi 5 plus cat ti a dat mai sus si msf va fi 55 si calculezi

Answer 2

$m_s=50g$

$c=15\%$

$m_{ad}=5g$

$c_f=?$

$c=\frac{m_d*100}{m_s}=\textgreater m_d=\frac{cm_s}{100}=7,5g$

$m_{d1}=m_d+m_{ad}=12,5g$

$m_{s2}=m_s+m_{ad}=55g$

$c_f=\frac{m_{d1}*100}{m_{s1}}=22,72\%$