Răspuns:
153,125 g NaOH
Explicație:
ρ = [tex]\frac{m_s}{V}[/tex] => [tex]m_s =[/tex] ρ * V = 1,225 [tex]\frac{g}{cm^3}[/tex] * 500 [tex]cm^3[/tex] = 612,5 g solutie NaOH 25%
[tex]\frac{c}{100} = \frac{m_d}{m_s}[/tex] => [tex]m_d = \frac{c*m_s}{100}=\frac{25*612,5}{100} =153,125g[/tex] NaOH
