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The pH of a 0.100 M formic acid solution (HCHO2) is 2.38 at 25 °C. Determine the Ka and pKa of formic acid
A gas is collected over water at a certain temperature. The total pressure is 762 torr. The vapor pressure of water at this temperature is 17 torr.
Aqueous solutions of phosphoric acid and sodium nitrite are combined, and the following equilibrium is established. H3PO4 (aq) + NO2- (aq) = H2PO4-(aq) + HNO2 (aq). The equilibrium constant Kc for this reaction is greater than one. Based on this i..
What is the theoretical yield of aspirin if 167 kg of salicylic acid is allowed to react with 123 kg of acetic anhydride?
A compound is known to have a free amino group with a pKa of 8.8, and one other ionizable group with a pKa between 5 and 7. To 100 mL of a 0.2 M solution of this compound at pH 8.2 was added 40 mL of a solution of 0.2 M hydrochloric acid.
What is the molecular formula for the alkane with 39 carbon atoms? What is the molecular formula for the cycloalkane with 38 carbon atoms?
A 0.204 g sample of a CO3^2- antacid is dissolved with 25.0 mL of a 0.0981 M HCl. The hydrochloric acid that is not neutralized by the antacid is titrated to a bromophenol blue endpoint with 5.83mL of 0.104 M NaOH. a) Calculate the number of moles..
calculate ground state energy, 1st excited energy level, and wavelenght of an electronic transition between the 2 lowest energy states for an electron
explain why addin eletcrons to a bonding orbital leads to bonding of an atom, in terms of electron distribution
the peptide Phe-Val-Lys-Ser using the appropriate protease in a phosphate buffer solution at pH=7. What two species would actually constitute the phosphate buffer?
Draw a diagram of a molecule of H2O ( Water), showing the outer layers and how the individual electrons are shared. 3. Why does each atom feel more stable?
Calculate the vapor pressure of water above this solution at 338 K. The vapor pressure of pure water at this temperature is 0.2467 atm
Write a reaction for the formation of a peptide bond between alanine and serine. React the amino group of alanine with carboxyl group of serine. Remember that there are 2 products in this reaction.
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