You have one test tube which contains a colorless solution that is either Ag+ (aq) or Bi+3(aq). Select a reagent that will allow you to differentiate between the two chemical species. If the solution is Ag+, what will happen when the reagent is added? If the solution is Bi+3, what will happen when the reagent is added?

Consider a culture medium on which only gram-positive organisms such as staphylococcus aureus colonies can grow due to an elevated nacl level. a yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the ph as a result and changing the color of a ph indicator chemical. this type of medium would be referred to as a differential and enrichment culture.