# Write the equation for the stepwise dissociation of substances in an aqueous solution: H2SO4, H3PO4, H2S, H2SO3

Explanation of the solution to the problem: in an aqueous solution, acids dissociate, giving one hydrogen cation successively, therefore, their stepwise dissociation is as follows:
H2SO4
1 st .: H2SO4 = H ^ (+) + HSO4 ^ (-)
2nd stage: HSO4 ^ (-) = H ^ (+) + SO4 ^ (2-)
General equation: H2SO4 = 2H ^ (+) + SO4 ^ (2-)
H3PO4
1 st .: H3PO4 = H ^ (+) + H2PO4 ^ (-)
2nd stage: H2PO4 ^ (-) = H ^ (+) + HPO4 ^ (2-)
3 st .: HPO4 ^ (2-) = H ^ (+) + PO4 ^ (3-)
General equation: H3PO4 = 3H ^ (+) + PO4 ^ (3-)
H2S
1 st .: H2S = H ^ (+) + HS ^ (-)
2nd item: HS ^ (-) = H ^ (+) + S ^ (2-)
General equation: H2S = 2H ^ (+) + S ^ (2-)
H2SO3
1 st .: H2SO3 = H ^ (+) + HSO3 ^ (-)
2nd stage: HSO3 ^ (-) = H ^ (+) + SO3 ^ (2-)
General equation: H2SO3 = 2H ^ (+) + SO3 ^ (2-) One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.