Trong 100 ml thì :
\(n_{H^+}=0.1\cdot\left(0.015\cdot2+0.03+0.04\right)=0.01\left(mol\right)\)
Trong 200 ml :
\(n_{H^+}=0.01\cdot2=0.02\left(mol\right)\)
\(H^++OH^-\rightarrow H_2O\)
\(0.02.......0.02\)
\(V_{dd_{NaOH}}=\dfrac{0.02}{0.2}=0.1\left(l\right)\)
\(n_{OH^-}=0.1\cdot\left(0.015\cdot2+0.03+0.04\right)=0.01\left(mol\right)\)
\(H^++OH^-\rightarrow H_2O\)
\(0.01.......0.01\)
\(V_{dd_{HCl}}=\dfrac{0.01}{0.2}=0.05\left(l\right)\)