2. Does the reaction presented in Problem 1 occur spontaneously as shown, and why? What is the equilibrium constant for the reaction? Given R-8.314 l/mol-k. 3. Identify the dominant acid species at pH 8 for the following acid-base systems: Acid: pK, Species Dominant Species at pH 8 Hydrochloric acid (HCI): PK, O HCI, CI Citric acid (H,CI): pK, = 3.13, pk, = 4.72, pk, = 6.33 H,CI, H.C.HC, ci Hydrogen sulfide (H2S): pk, = 6.99, pk, = 12.92 HAS, HS,S Ammonium ion (NHA"): pK= 9.26 NH, NH3 4. Convert 200 mg/L calcium phosphate (Cas(PO.)2) to mg/Las Caco