Question

Peste o solutie cu 600 g ce contine 30% subtanta dizolvata se adauga 450 g apa .Sa se afle concentratia solutiei finala.

Answer 1

$m_d=\frac{30*600}{100}=180g. --->C_f=\frac{m_d*100}{m_s}=\frac{180*100}{1050}=17,14$%