Calculate the approximate concentration of the uncharged form of alanine (see below) in a 0.01M solution of alanine at (a) pH 2.4 (b) pH 6.15 and (c) pH 9.9.
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- (2) Tris buffer is an organic buffer that is commonly used in Biochemistry experiments in lieu of inorganic buffer. Discuss the structure, buffering properties, and advantages of using Tris buffer. Cite 2-3 references properly.The weak acid HA is 2% ionized (dissociated) in a 0.20 M solution. (a) What is Ka for this acid? (b) What is the pH of this solution?The amino acid histidine has ionizable groups with p?a values of 1.8, 6.0, and 9.2, as shown. A biochemist makes up 95 mL of a 0.15 M solution of histidine at a pH of 5.3. She then adds 60 mL of 0.10 M HCl. What is the pH of the resulting solution?
- The much-abused drug cocaine is an alkaloid. Alkaloids are noted for their bitter taste, an indication of their basic properties. Cocaine, C17H21O4N, is soluble in water to the extent of 0.17g/100mL solution, and a saturated solution has a pH = 10.08. What is the value of Kb for cocaine?Glycine hydrochloride (Cl− H3N+CH2COOH) is a diprotic acid that contains a carboxylic acid group and an ammonium group and is therefore called an amino acid. It is often used in biochemical buffers. Solve, In analogy with Figure , sketch the titration curve of this diprotic acid.The pH of a fruit juice is 4.8. Find the hydronium ion concentration, [H3O*], 0 of the juice. Use the formula pH = -log [H3O*]. ... The hydronium ion concentration [H3O*] is approximately moles per liter. (Use scientific notation. Use the multiplication symbol in the math palette as needed. Round to the nearest tenth as needed.)
- 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.Identify the acid on the left and its conjugate base on the right in the following equations:(a) HOCl + H2O ↔ H3O+ + OCl-(b) HONH2 + H2O ↔ HONH3+ + OH-(c) NH4+ + H2O ↔ NH3 + H3O+(d) 2HCO3-2 ↔ H2CO3 + CO3-2 (e) PO4-3 + H2PO4- ↔ 2HPO4-2Calculate the normality of a solution that contains 4.5 g of (COOH)2 in 3000 mL of solution? (Assume the (COOH)2 is to be completely neutralized in an acid-base * reaction.) 0.033 N O 0.33 N O 0.166 N O 0.0166 N 0.45 N O 0.045 N 000.0 OO
- Consider the following acids and their ionization constant, determine which conjugate base is HCOOH Ka = 1.7 x 10-4 (b) HCN Ka = 4.9 x 10-10Buffers are aqueous solutions that tend to resist changes in pH when small amounts of strong acid (H+) or base (OH-) are added. Compare the changes in the pH of the resulting solution when you add 0.1 M NaOH in (a) distilled water and (b) bicarbonate solution. A) (a) and (b) solutions will have the same pH. B) pH change in (b) will be higher than in (a). C) No changes in pH of both solutions. D) pH change in (a) will be higher than in (b).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.