Calculate the pH of 0.10 M H3PO4 aqueous solution. ( the pKa1= 2.15, Pka2=7.20, and pKa3= 12.37 for H3PO4)

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.