How many milliliters of 0.255 M Na2S2O3 solution are needed for complete reaction with 2.486 g of I2 according to the equation: I2(aq)+2S2O32−(aq)→S4O62−+2I−(aq)

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.