Which of the following is the principle of the reagent strip test for specific gravity? a. Disassociation of the indicator bromothymol blue, producing a pH change b. Ionization of a polyelectrolyte,...

Which of the following is the principle of the reagent strip test for specific gravity?

a. Disassociation of the indicator bromothymol blue, producing a pH change b. Ionization of a polyelectrolyte, producing a pH change detected by bromothymol blue c. Disassociation of polyelectrolyte, producing a pH change detected by bromothymol blue d. Change in the pK of bromothymol blue to produce a pH change