1. What is the net charge of aspartic acid when the pH is 0.10? 2. Draw the pre-dominant form of aspartic acid when the pH is 2.1 3. Draw the zwitterionic form of aspartic acid. Give the approximate pH value wherein the zwitterionic form exist.
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- Consider the following pH titration curve of a diprotic acid. What is the approximate values for pka 1 and pka 2? the curve is attached below.Given the titration curve of the hypothetical polyprotic acid X at 0.100 M concentration (pKa1=4.0, pKa2=8.0, pKa3=12.0) titrated with 0.600 M NaOH, identify the pH at point C, H, E, and M.The ionization of p-nitrophenol is shown below (pKa = 7.0): a. Identify the weak acid and conjugate base. b. At pH 7, what are the relative concentrations of ionized and un-ionized p-nitrophenol? c. If enough concentrated hydrochloric acid is added to a solution of p-nitrophenol to lower the pH from 7 to 5, what will happen to the relative concentrations of the ionized and un-ionized forms? d. Ionized p-nitrophenol has a yellow color, while the un-ionized form is colorless. The yellow color can be measured using a spectrophotometer at 400nm. In order to determine the total amount of p-nitrophenol in a solution, would you perform the spectrophotometer reading at an acidic or basic pH? Clearly explain why? e. A solution of p-nitrophenol at pH 7.95 was found to have an A400 of 0.255 . What is the total concentration (in µM) of p-nitrophenol (ionized plus un-ionized) in the solution? The molar extinction coefficient of p-nitrophenol is 18,500 M-1cm-1 and the pKa is 7.
- Glucose-1-phosphate has a ΔG°′ value of −20.9 kJ/mol, whereas that for glucose-6-phosphate is −12.5 kJ/mol. After reviewing the molecular structures of these compounds, explain why there is such a difference in these values.Propanamide and methyl acetate have about the same molar mass, both are quite soluble in water, and yet the boiling point of propanamide is 486 K, whereas that of methyl acetate is 330 K. Explain.What is the ratio of [isocitrate] to [citrate] under cellular conditions at 37°C?
- The net charge on the most prevalent form of bisphosphoglycerate in blood is what?WHAT ARE THE ADVANTAGES AND DISADVANTAGES OF CARBOHYDRATES IN BIOCHEMISTRY? GIVE AT LEAST 3 FOR EACH AND EXPLAIN. WHAT IS THE PRINCIPLE AND APPLICATION OF BENEDICT'S TEST IN THE TEST FOR REDUCING SUGAR?Identify the conjugate acid-base pairs in the following reactions: HNO2(aq) + H2O(l) → NO2 – (aq) + H3O+(aq) _______ ______ _________ ________ CH3NH2 + H2O(l) → CH3NH3+ + OH – _______ ________ ________ _________
- If the average molar mass of a sample of soybean oil is 1500 g/mol, how many grams of NaOH are needed to saponify 5.0 g of the oil?Tomato juice has a OH- concentration equal to 1 X 10 -10, what is the pH of this solution?What is the molarity of a solution with 100 g fructose dissolved in 0.7 L water?