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The pI for amino acids (the pH of the isoelectric point) is exactly half-way between the pKa values of the two functional groups. Note that the aspartame has the carboxylic acid functionality of phenylalnine converted to an ester and the carboxylic acid of aspartic acid and linked as an amide to the amine group of phenylalanine. This leaves the aspartic acid amine group and the side chain carboxylic acid functional group of aspartic acid. Therefore aspartame will have an isoelectric point at a pH between the pKa values of these functional groups. Find the values for these two groups of aspartic acid and calculate a predicted pI value for aspartame.
A reaction was conducted in benzene as the solvent. Because the reaction was very exothermic, the mixture was cooled in a salt-ice bath. This was a bad choice. Why?
If all the energy obtained by by burning 1.26 lb of butane (fuel value is 10.85 kcal/g) is used to heat 126.0 kg of water at an initial temp of 19.7C, what is the final temperature.
Consider a mixture of ingrediants at equilibrium for this reaction. 2 PH3 (g) P2 (g) + 3 H2 (g) Which of these is true if the container volume
a compound contains 87.7% carbon and 14.3% hydrogen.its relative molecular mass is 70.what is the empirical formula and the molecular formula.and is it an alkane or alkene
What is the difference between robustness and intermediate precision?
which of the following transition metal complexes is diamagnetic?
As a technician in a large pharmaceutical research firm, you need to produce 350.mL of 1.00 M potassium phosphate buffer solution of pH = 6.87. The pKa of H2PO4- is 7.21.
At constant pressure, 660 mL of nitrogen at 37°C are changed to 725 mL What is the new temperature of this gas?
A small organic molecule required by an enzyme in order for the enzyme to be a functional catalyst is known as a vitamin. Lipids that are solids at room temperature tend to have more double bonds than liquids at room temperature
volumetric flask and diluted to the mark with deionized water. The iron concentration of this dilute solution was determined to be 0.00112 M. what percent of this compound is iron?
The I2 that did not react with ascorbic acid is then determined in a thiosulfate reaction. If 40.0mL of 0.4445M I2 was added to a sample containing vitamin C, the unused I2 required 19.05mL of 0.142M S2O32- to react. How many moles of vitamin C we..
A stock solution is prepared by adding 22 mL of 1 M Na3PO4 to enough water to make 73 mL. What is the PO43- concentration of 30 mL of the stock solution?
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