Question

[Quân Trịnh]

trộn 300 ml dd Naoh 1M vs 200ml dd Naoh 1.5M.Tính C% và CM của dd thu đc biết D=1.05g/ml

Answer 1

[B.Thị Anh Thơ]

\(\left\{{}\begin{matrix}n_{NaOH\left(dd.1M\right)}=0,3\left(mol\right)\\n_{NaOH\left(dd.1,5M\right)}=0,2.1,5=0,3\left(mol\right)\end{matrix}\right.\)

\(n_{NaOH\left(dd.sau\right)}=n_{NaOH\left(dd.1M\right)}+n_{NaOH\left(dd.1,5M\right)}=0,3+0,3=0,6\left(mol\right)\)

\(V_{dd\left(sau\right)}=300+200=500\left(ml\right)=0,5\left(l\right)\)

\(\Rightarrow CM_{dd\left(sau\right)}=\frac{0,6}{0,6}=1,2M\)

\(\left\{{}\begin{matrix}m_{dd.sau}=500.1,05=525\left(g\right)\\m_{NaOH}=06.40=24\left(g\right)\end{matrix}\right.\)

\(\Rightarrow C\%_{Dd\left(spu\right)}=\frac{24}{525}.100\%=4,57\%\)