Question

H2S+HCO3=S+HCl+H2O найти ОВР

Answer 1

H2S + HCO3 = S + CO2 + H2O
S⁻² - 2e⁻ = S°     
C⁺⁵+ 1e⁻ = C⁺⁴   

Answer 2

S⁻² - 2e⁻ = S°     
C⁺⁵+ 1e⁻ = C⁺⁴   
H₂S + HCO₃ = S + CO₂ + H₂O