21. Solving a chemistry problem

9. Describe the analytical features (aggregate state, solubility in water, acids, alkalis, etc., electrolyte strength, color, redox properties, amphotericity, hydrolyzability).
2. For poorly soluble compounds, write the expressions for the solubility product, find their value in the reference book and write it down.
3. For weak electrolytes, write the dissociation equations and expressions for the electrolytic dissociation constant, find their values in the reference book and write them down.

9.
PbSO4
H2SO3
KNO2
CuS