How many grams of hno3 it is required to play 8.75gr n2o
4zn + 10hno3-4zn ( no3 ) 2 + n20 + 5h2o

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.