Ta có: \(C_{\%_{Ba\left(OH\right)_2}}=\dfrac{m_{Ba\left(OH\right)_2}}{250}.100\%=34,2\%\)
=> \(m_{Ba\left(OH\right)_2}=85,5\left(g\right)\)
=> \(n_{Ba\left(OH\right)_2}=\dfrac{85,5}{171}=0,5\left(mol\right)\)
Ta lại có: \(C_{\%_{H_2SO_4}}=\dfrac{m_{H_2SO_4}}{150}.100\%=4,9\%\)
=> \(m_{H_2SO_4}=7,35\left(g\right)\)
=> \(n_{H_2SO_4}=\dfrac{7,35}{98}=0,075\left(mol\right)\)
a. PTHH; Ba(OH)2 + H2SO4 ---> BaSO4↓ + 2H2O
Ta thấy: \(\dfrac{0,5}{1}>\dfrac{0,075}{1}\)
Vậy Ba(OH)2 dư.
Theo PT: \(n_{BaSO_4}=n_{H_2SO_4}=0,075\left(mol\right)\)
=> \(m_{BaSO_4}=0,075.233=17,475\left(g\right)\)
b. Ta có: \(m_{dd_{BaSO_4}}=250+7,35=257,35\left(g\right)\)
=> \(C_{\%_{BaSO_4}}=\dfrac{17,475}{257,35}.100\%=6,79\%\)
