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Calculate the pH at 25°C of an aqueous solution that is 0.320 M in ethylamine and 0.140 M in ammonia (i.e.the solution contains both compounds). NOTE that the pKa of the conjugate acid of ethylamine is 10.65 and the pKa of the conjugate acid of ammonia is 9.25 (both at 25°C).
detailed procedure of determining the enthalpy of reaction between citric acid (H3Cit) and sodium hydroxide (NaOH). Calculate what volume of each .50M solution should be mixed to give a total volume of 50.0mL and the reactants in the correct stoic..
What mass of sodium cyanide must be added to 250ml of water in order to obtain a solution having a pH of 10.50? Ka(HCN) = 4.9 x 10 ^-10
Describe, using Raoult's law and Dalton's law of partial pressure, why the vapor pressure of a pair of miscible ideal liquids will always be somewhere in between the vapor pressures of the pure liquids (at the same temperatures).
Draw (2R,3R)-2-bromo-3-phenylpentane in the conformation from which it is most likely to undergo E2 elimination to give 3-phenyl-2-pentene.
What force keeps the gases of the earth's atmosphere from diffusing into interplanetary space, where the pressure is essentially zero?
We did a lab in Chem where we put a liquid into a flask, secured foil on the top and poked a hole in the foil so the vapor could push out the air
Chemical Kinetics - Show that only the reactants of the slow step of a reaction are found in the rate law of the reaction - which of the two steps is slower and which substance (if any) is probably an unstable intermediate?
Transmittance, T, is defined as the intensity of light transmitted through a sample divided by the intensity of light incident on the sample. The absorbance, A, is defined as
100 mL of a buffer that consists of 0.20 M NH3 and 0.20 M NH4Cl is titrated with 25 mL of 0.20 M HCl. Calculate the pH of the resulting solution given that the Kb for NH3 is 1.8 x 10-5.
What would the pH at the half-equivalence point be for the first ionization of the triprotic acid phosphoric
transferred from an oven (183°C) to 189 g of water at 23.2°C, into which it is immersed. The water and steel together reach a temperature of 27.9°C. What is the mass of the steel in grams
The Kb of methylamine, CH3NH2, is 4.2 x 10-4. Calculate the pH of a solution of 0.431 M methylamine.
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