Question

Tính số mol các ion có trong : a) 100ml dung dịch HNO3 0.25M b) 200ml dung dịch Ba(OH)2 0,15M c) 200ml dung dịch AL2(SO4)3 0.2M

Answer 1

a) Ta có: \(n_{HNO_3}=0,1\cdot0,25=0,025\left(mol\right)=n_{H^+}=n_{NO_3^-}\)

b) Ta có: \(n_{Ba\left(OH\right)_2}=0,2\cdot0,15=0,03\left(mol\right)\) \(\Rightarrow\left\{{}\begin{matrix}n_{Ba^{2+}}=0,03\left(mol\right)\\n_{OH^-}=0,06\left(mol\right)\end{matrix}\right.\)

c) Ta có: \(n_{Al_2\left(SO_4\right)_3}=0,2\cdot0,2=0,04\left(mol\right)\) \(\Rightarrow\left\{{}\begin{matrix}n_{Al^{3+}}=0,08\left(mol\right)\\n_{SO_4^{2-}}=0,12\left(mol\right)\end{matrix}\right.\)