3. The pKa,1 and pKa,2 of ortho and para isomers of phthalic acid (diprotic acid) are shown below: Provide an explanation on the differences of their pKa values.
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3. The pKa,1 and pKa,2 of ortho and para isomers of phthalic acid (diprotic acid) are shown below:
Provide an explanation on the differences of their pKa values.
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- A typical amino acid with one amino group and one carboxylic acid group, such as serine can exist in water in several iconic forms. Suggest the forms of the amino acid at low pH and at a high pH. Amino acids generally have two pKa values, one in the range of 2 to 3 and the other in the range of 9 to 10. Serene, for example, has pKa values of 2.91 and 9.21. Using species such as acetic acid and ammonia as models, suggest the origin of the two pKa values. Glutamic acid is an amino acid that has three pKa’s: 2.10, 4.07, and 9.47. Draw the structure of glutamic acid and assign each pKa to the appropriate part of the molecule. An unknown amino acid is titrated with strong base, producing the following titration curve. Which amino acid are likely candidates for the unknown?Acetic acid (CH3COOH, abbrev HA) is a very common weak acid with pKa = 4.75 (at 25oC and low ionic strength) A] Write down the dissociation equation of the weak acid HA in aqueous solution, derive the respective formulae for the dissociation constant Ka and pKa. B] Calculate pH of the diluted solution of acetic acid with concentration, c = 0.05 mol/dm3 C] What is the approximate pH of the aqueous acetate buffer solution composed of dissolved mixture of acetic acid (HA) and sodium acetate (NaA) in the same respective concentrations? What is the working pH range of acetate buffers? D] How can you prepare exactly 1 dm3 of acetate buffer solution with required pH 5.0 and the total concentration [HA + NaA], c = 0.01 mol/dm3 if the stock solution of acetic acid (HA) with concentration, cHA = 0.1 mol/dm3, anhydrous sodium acetate (NaA, MT = 82.03 g/mol) and purified water are available? E] Acetate buffer solution may be also prepared by the partial neutralization of HA with NaOH: 20 cm3 of…Acetic acid (CH3COOH, abbrev. HA) is a very common weak acid with pKA = 4.75 (at 25oC and low ionic strength). Calculate pH of the diluted solution of acetic acid with concentration c = 0.05 mol dm-3.
- The pKa values of the conjugate acids of 2-aminopyridine (6.71) and 4- aminopyridine (9.11) are as shown. Which nitrogen is the more basic in these structures and why?Deduce expressions for the fractions of each type of species present in an aqueous solution of lysine as a function of pH and plot the appropriate speciation diagram. Use the following values of the acidity constants: pKa (H3Lys2+) = 2.18. pKa (H2Lys+) = 8.95, pKa(Hlys) = 10.53.spectrochemical series which is the interaction relationship of Lewis bases with metals oftransition: a) Explain the order of each base in relation to Fe3+. Why?b) Determine the order of bases with respect to NH4+. Why?
- Phosphoric acid (H3PO4) has 3 dissociable protons with the pKa values shown. Which form of phosphoric acid predominates in a solution at pH 4? Explain. Acid pKa H3PO4 2.14 H2PO4- 6.86 HPO42- 12.42 What can be described if a sample analyzed by AAS shows the following results:Phosphotungstic acid is one of a number of heteropolyacids. Name additional elements you can bind into heteropolyacids. Why are certain heteropolyacids so important for gravimetric determination of the heteroelement? Briefly describe, draw and discuss at least three of their structures.
- A newly synthesized drug was found to have a carboxyl group, an imide and a sulfonamide group. The first type of method to consider in this drug molecule’s quantitatve analysis is: a. Non-aqueous Alkalimetryb. Non-aqueous Acidimetryc. Aqueous Alklaimetryd. Aqueous AcidimetryA typical amino acid with one amino group and one carboxylicacid group, such as serine, can exist in water in several ionic forms. (a) Suggest the forms of the amino acidat low pH and at high pH. (b) Amino acids generally havetwo pKa values, one in the range of 2 to 3 and the other inthe range of 9 to 10. Serine, for example, has pKa values of2.19 and 9.21. Using species such as acetic acid and ammoniaas models, suggest the origin of the two pKa values.(c) Glutamic acid is an amino acid that has threepKa's: 2.10, 4.07, and 9.47. Draw the structure of glutamicacid, and assign each pKa to the appropriate part of themolecule. (d) An unknown amino acid is titrated withstrong base, producing the following titration curve.Which amino acids are likely candidates for the unknown?Consider the following data. For the acid: HA- Ka = 7.46⋅10−87.46⋅10-8 Calculate the Kb for A2-. Report your answer in scientific notation using 3 sig figs.