2NaOH + H2SO4 → Na2SO4 + 2H2O
\(n_{H_2SO_4}=0,1\times0,5=0,05\left(mol\right)\)
a) Theo PT: \(n_{NaOH}=2n_{H_2SO_4}=2\times0,05=0,1\left(mol\right)\)
\(\Rightarrow V_{ddNaOH}=\dfrac{0,1}{1}=0,1\left(l\right)=100\left(ml\right)\)
b) Theo PT: \(n_{Na_2SO_4}=n_{H_2SO_4}=0,05\left(mol\right)\)
\(V_{dd}saupư=V_{ddH_2SO_4}+V_{ddNaOH}=100+100=200\left(ml\right)=0,2\left(l\right)\)
\(\Rightarrow C_{M_{NaOH}}=\dfrac{0,05}{0,2}=0,25\left(M\right)\)