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The following is adapted from an Environmental Engineering P.E. Exam. The total phosphate concentration (TOTPO4) in a river is 5.8 mg/L as P. The pH of the river is 7.6. What is the concentration of H2PO4- and HPO42-, expressed as mg P/L? The equilibrium constants needed to work this problem are given in Table 2-3 (under Phosphoric Acid). Hint: use the mass balance equation for phosphate species and equilibria expressions to solve this problem: TOTPO4 = [H3PO4] + [H2PO4-] + [HPO42-] + [PO43-]
If a 0.135 g sample of NaCl were placed on an ion exchange column in the H+ form and the eluate titrated with 0.1231 M NaOH, what volume of the NaOH solution would be required to reach a phenolphthalein end point
The procedure instructs you to use a stir bar to mix the solution while adding NaOH. Descirbe any differences in the graph
Which solution behaves more ideally, a 5.0% by weight NaOH (aq) solution (b.p. = 102 ºC) or a 50. % NaOH (aq) solution (b.p. = 140. ºC) Support your answer with calculations (hint: what are the theoretical boiling points for these solutions).
At high temperature, hydrogen and carbon dioxide will reversibly react to form carbon monoxide and water vapor. At 986 C there are 0.11mol of each product and 0.087mol of each reagent in a 1.00L flask. What is Kc under these conditions
In a first order decomposition in which the rate constant is 0.00830 sec-1, how long will it take (in minutes) until 0.309 mol/L of the compound is left, if there was 0.517 mol/L at the start
The half-life of 137Ce is 30. years. If we have 150.000 g of 137Ce now, how many grams of Ce will remain in 150. years?
A solution prepared by dissolving 20.0 mg of insulin in water and diluting to a volume of 5.00 mL gives an osmotic pressure of 12.5 mm Hg at 300 K. What is the molecular mass of insulin?
An electrochemical cell was constructed from Sn/Sn2+ and Pb/Pb2+ with KNO3 as the salt bridge. The concentrations were Sn2+ =1.0M and Pb2+ = 0.1M.
Calculate the rate constant of the catalyzed and uncatalyzed reactions. How many folds of rate enhancement are produced by the enzyme? The rate constant is 13.46 but what is the nuber of folds of enhancement that are produced by the enzyme?
calculate the mass kg of the solute c4h8o and the volume ml of the solvent c6h6 that should be combined to generate
what is the chemical formula of a homonuclear diatomic gas if it has a pressure of 1.40 atm and a density of 1.82 gl at
Presence of Aldehyde Group, An excellent way to identify the presence of an aldehyde group is by 1H NMR. The chemical shift of the aldehydic proton occurs in the 9-10-ppm region
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