Question

Câu 17. Thể tích dung dịch HCl 0,6M  cần để trung hoà 150ml dung dịch NaOH 0,4M là 

 A. 20ml B. 100ml C. 50ml D. 80ml 

Answer 1

\(NaOH+HCl \to NaCl+H_2O\\ n_{NaOH}=0,06(mol)\\ \to n_{HCl}=0,06(mol)\\ V_{HCl}=\frac{0,06}{0,6}=0,1(l)=100(ml)\)

Answer 2

\(n_{OH^-}=0,4.0,15=0,06\left(mol\right)\)

\(n_{H^+}=0,6.V_{HCl}\)

Để trung hòa thì \(0,6.V_{HCl}=0,06\Rightarrow V_{HCl}=0,1\left(l\right)=100\left(ml\right)\)