nBaO = \(\dfrac{30,6}{253}\)= 0,12 mol
a) BaO + H2O -> Ba(OH)2
0,12...............->0,12
CM(Ba(OH)2) = \(\dfrac{0,12}{0,5}\) = 0,24 M
b)=> mBa(OH)2 = 0,12 . 171 = 20,52 g
- ta có ;
14,6% = \(\dfrac{m_{HCl}}{m_{HCl}+20,52}\).100%
=> mHCl = 3,5 g