K2SO4 + Ba(OH)2 => BaSO4↓ + 2 KOHKOH(недостаток) + H2S => KHS + H2O KHS + KOH => K2S + H2O K2S + Pb(NO3)2 => PbS↓ + 2 KNO3
K2SO4 + Ba(OH)2 => BaSO4↓ + 2 KOH
KOH(недостаток) + H2S => KHS + H2O
KHS + KOH => K2S + H2O
K2S + Pb(NO3)2 => PbS↓ + 2 KNO3