52. Solving a chemistry problem

243.1. Write dissociation equations and dissociation constants for weak electrolytes.
№ 2. According to the given ionic equations, write the corresponding molecular equations.
No. 3. Determine the pH of a solution of a given concentration. When calculating the pH of a weak electrolyte solution, take into account the first stage of dissociation. The values of the dissociation constants of weak electrolytes are given in the reference tables (Appendix 5).
Table 6

Task No. No. 1 No. 2 No. 3
243 H3AsO4 FeOHSO4, Zn(NO3)2, Zn(OH)2, LiHSO3, Ni2 OH– Cl– = NiOHCl 0.003M Zn(OH)2,