calcium phosphate reacts with aqueous nitric acid to produce phosphoric acid and calcium nitrate Ca3(PO4) 2+6HNO3-2H2PO4+3Xa(NO3)2. (1) a 7.26g sample of calcium phosphate reacted completely when added to an excess of aqueous nitric acid to form 38.0cm3 of solution. Calculate the concentration in moldm^-3 of phosphoric acid in this solution.

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.