(1) Given that an indicator is itself a weak acid or base, why does adding it to a solution not change the nature of the equilibrium?

(2) Starting with about 10 mL of dilute NaCl(aq) containing a couple of drops of phenol red indicator, what color would the solution be for each of the following actions:

(a) First 10 drops of 1.0 M HCl(aq) are added to the solution; 

(b) Next 15 drops of 1.0 M NaCH₃COO(aq) are added to solution (a);

(c) Then one drop of 1.0 M KOH(aq) is added to solution (b);

(d) 10 more drops of 1.0 M KOH(aq) are added to solution (c).