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Problem- A new potential heart medicine, code-named X-281, is being tested by a pharmaceutical company, Pharma-pill. As a research technician at Pharma-pill, you are told that X-281 is a monoprotic weak acid, but because of security concerns, the actual chemical formula must remain top secret. The company is interested in the drug's Ka value because only the dissociated form of the chemical is active in preventing cholesterol buildup in arteries. To find the pKa of X-281, you prepare a 0.077M test solution of X-281. The pH of the solution is determined to be 2.40. What is the pKa of X-281? Express your answer numerically.
Please explain why you chose your answer!
A 5.0 dm3 sample of oxygen at a pressure of 200kPa and 2.0dm3 sample of nitrogen at a pressure of 500kPa are introduced into a 2.5dm3 vessel.
Calculate the molality of a 0.052 M solution of ethyl alcohol in water at 25 degree Celsius. (assume the density of the solution at such low concentration is equal to that of water at 25 degree Celsius,0.997 g/mL.)
A buffer contains 0.16mol of propionic acid (C2H5COOH) and 0.17mol of sodium propionate(C2H5COONa) in 1.20 L. 1)What is the pH of this buffer?
You have a 1.23-mol sample of water at ?30.°C, and you heat it until you have gaseous water at 140.°C. Calculate q for the entire process. Use the following data.
In an organic chemistry lab, why would you not simply oxidize p-toluidine with KMnO4 to make p-aminobenzoic acid if it would be a faster method than using multi-step organic synthesis
Problem- Every alpha amino acid has at least two possible sites for acid/base reactivity: the carboxylic acid site (pKa approx 2) and the amino site (pKa 9-10). Which amino acids have a third group that can undergo acid/base chemistry
The true rate constant for a reaction is just that, a constant( at the constant temperature). Would your calculated value for k be higher than, lower than, or equal to the real value of k if 5 wt% bleach was unknowingly substituted with 8wt% bleac..
determine the emf of a fuel cell that oxidizes hydrogen according to the reaction2h2 g o2 g --gt 2h2o lunder the
Calculate the theoretical amount of NH4NO3 that would be required to change the temperature of 50 ml of water from room temperature 20 C to 5 C.
If 0.130 mol a third gas is added with no change in volume or temperature, what will the total pressure become?
2A yields 3B; ?H -50 kJ. If 9 moles of B are formed during this reaction, what was the enthalpy change
Draw and illustrate the difference in the three dimensional structure of Ethene and point out the difference between this and Ethane
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