99. Solving a chemistry problem

1. Write the equation for the dissociation of a given electrolyte (p.3) in an aqueous solution. Determine if the electrolyte is strong or weak. Write an equation for the hydrolysis of a given salt in all possible steps, indicate the reaction of the medium with an aqueous salt solution.
2. Write down the expressions for the hydrolysis constants for each step. Calculate the hydrolysis constant of the indicated salt according to the 1st stage of hydrolysis.
3. Calculate the pH value of the solution of this electrolyte at a given molar concentration of the salt solution C0, mol/l, taking into account only the first stage of hydrolysis.
variant electrolyte С0, mol/l
4NH4Cl 0.05