How many grams of silver nitrate must be added to 250.0 mL of a clear, saturated solution of Ag2SO4 to reduce the molar solubility of Ag2SO4 to 1.0 x 10-3 ?

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.