The Kb for ascorbic acid at 25 oC is 6.3×10^−5. Calculate its pKa

Q: The Ka for an acid is 4.45 x 10-10. Calculate the pKa for this acid.

A: Ka = 4.45 x 10-10

Q: What is the sum of the pka for the ionization of acetic acid and the pkb for the hydrolysis of…

A: Acetic acid is a weak acid  Ka = 1.75×10-5The ionization reaction of acetic acid is represented…

Q: Ka for acetic acid is 1.8 x 10-5. What is the first digit of the pKa value for acetic acid?

A: Ka is a dissociation constant of acid Here the acid is given acetic acid Formula for pKa = -log ka…

Q: What percentage of the e-amino group of lysine will be protonated at its pI?< 25%…

A: The isoelectric point of the Amino acid is the pH at which the amino acid has net neutral charge or…

Q: Lysine has the following pK a values: pK 1 = 2.18 pK 2 = 8.95 pK R = 10.79 Give the structure and…

A: Lysine is an amino acid and it has two functional group which are amine and carboxyl group and they…

Q: - What is the dominant form of aspartic acid (a triprotic acid (H3A+)) at a pH of 50 (pKa1 = 1.990,…

A: In Q4 the correct option is 5-choices 1,3 and 4 are correct this is so because the stronger the acid…

Q: If the pKa of an organic molecule is 8, it's buffering range is around pH     7-8     8…

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Q: What is the Kb of a base whose pKa is 8.9?

A: The question is based on conjugate acid base principle. a strong acid has a weak conjugate base and…

Q: Glycine has pKa values of 2.34 and 9.60. At what pH does glycine exist in the indicated form?

A: The first set of structures is a 50:50 mixture. The 50% of amino group of the glycine are released…

Q: Describe the preparation of 2.00 L of 0.100 M glycine buffer, pH 9.0, from glycine and 1.00 M NaOH.…

A: Number of moles of Glyciene buffer required = Volume  x  Molarity of Solution => 2L x  0.100 =…

Q: Explain the order of elution (with a buffer of pH 4) of the following pairs of amino acids through a…

A: (a)  Comparing the structure of aspartate and serine as shown. Aspartate has the carbonyl group…

Q: What is the pKa of the conjugate acid of a base that has a Kb value equal to 2.1 × 10-7? Report your…

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Q: Identify and match the lettered regions in the titration curve of a basic amino acid. Alpha amino…

A: The pH of alpha-carboxylic acid: As we add OH, we begin to deprotonate the stronger of the two…

Q: What is the pKa of a weak acid with a Ka of 4.7 X 10-6?

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Q: Why is protonated pyrimidine (pKa = 1.0) more acidic than protonated pyridine (pKa = 5.2)?

A: The structure of protonated Pyrimidine and protonated Pyridine is as shown below:

Q: Which of the following is the primary and secondary species of EDTA at pH 2.05? (a) H&Y*, HsY* (d)…

A: EDTA is ethylene diammine tetraacetic acid. PH is defined as negative logarithm of hydrogen ions…

Q: Ka for acetic acid is 1.8 * 10-5. What is the first digit of the pKa value for acetic acid?

A: pKa value indicates the strength of an acid. The more the value of pKa, the more acidic will be the…

Q: At its pK, what percentage of boric acid is ionized? 50%. 75%. 25%. 100%. 10%. QUESTION 2 The side…

A: For the first Question, you can used the Hinderson equation for determination the percentage of…

Q: Which of the Allowing Paren thes) has the highest molor heat Cupacity in water? a) Glyeine (97A) 6)…

A: Heat capacity of a substance is defined as the amount of heat to be given to that substance of a…

Q: If an acid with a pKa of 5.3 is in an aqueous solution of pH 5.7, what percentage of the acid is…

A: Henderson Hasselbalch equation is given below. During a dissociation of acid in aqueous solution,…

Q: The amino acid histidine has ionizable groups with pKa values of 1.8, 6.0, and 9.2, as shown. COOH…

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Q: What is the conjugate acid of HPO24- anion?

A: An acid is the species which can lose protons in aqueous solution while a base can accepts a protons…

Q: The side chain of acetyl-L-lysine-OMe has a pKa=10.5 and its acid-dissociation reaction  is shown…

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Q: At 25 °C the pKb for propanoate, C2H5COC", is 9.13. What is the pKa for its conjugate acid? a. 4.87…

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Q: Please consider the structural formula of the amino acid shown below when answering the following…

A: (A) draw the form of this amino acid that predominates at pH 8  This pH is highly basic so that both…

Q: If the pka of CH3COOH is 4.74 and the pH of an CH3COOH/ CH3COONa buffer solution is 4.95, which of…

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Q: The K, for acetic acid (CH,COOH) is 1.737 × 10-5. What is the pK, for this acid? pKa = Use the…

A: We know that, pKa is the negative logarithm of Ka. i.e.                     pKa= -logKa We have, Ka…

Q: ) The isoelectric point of histidine is pH 7.6. Draw the structures of the major forms of histidine…

A: GIVEN: Isoelectric point (pI ) = 7.6 Histdine at pH values of 1, 4, 7.6 , 11

Q: At 25 °C, what is the value of Kb for the cyanide anion, CN? Ka(HCN) = 6.2 × 10-10 O 1.6 x 10-4 O…

A: The question is based on the concept of EQUILIBRIUM. We have been given Kb value. We need to…

Q: A student determines that the value of Ka for H2CO3 = 5.7×10-7 . What is the value of pKa?

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Q: If the pKa of a molecule is 2, what is the %A- at pH = 5? Report the answer to one decimal place.…

A: Given : pH of solution = 5 And pKa of acid = 2 The partial dissociation reaction of HA can be…

Q: The side chain of acetyl-L-lysine-OMe has a pKa=10.5 and its acid-dissociation reaction  is shown…

A:

Q: The Kb for dimethylamine, CH3NH2, at 25oC is 4.0×10-4. What’s the Ka of its conjugate acid?

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Q: HEPES ((4-(2-hydroxyethyl)-1-piperazine ethane sulfonic acid) is a commonly used cell culture buffer…

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Q: The pKa of Cl3CCO2H is 0.64. What is the pH of a 0.580 M solution? What percentage of the Cl3CCO2H…

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Q: If the pKa values for the bases were given, I would know how to solve this but how can I know just…

A: The proton of the given alkyne is acidic. To deprotonate the alkyne proton the strong base is…

Q: 3) When discovered, Miescher found that the nuclei of pus cells were acidic. We now know that the…

A: DNA is formed of a double helix strands, where each strand is composed of sugar moieties and…

Q: What is the [A-]/[HA] concentration ratio required to obtain a pH 5.3, given that the pka of HA is…

A: The pH of a buffer (HA/A-) is determined using Henderson-Hasselbalch equation- pH = pKa +…

Q: Which buffer(s) would give the amino acid tyrosine an overall negative charge? Select all that are…

A: Amino acids have an amino group as well as a carboxylic acid functional group. In acidic medium, the…

Q: 8. What is the optimum pH to separate a mixture of lysine (2.2, 9,0, 10.0), arginine (1.82, 8.99,…

A: Differences in isoelectric point (pI) can be used to separate a mixture of amino acids by…

Q: Which nitrogen is pKa1 and pKa2 and explain why. Draw the salt form at ohysiological pH

A: PKa= - log Ka  Where Ka = acid dissociation constant  Now with increase in acidity that i.e. with…

Q: Cuivan Coreeak base C₂H₂0 Nuo ₂. a 2. kb = 3.98 x 10-11 trund the PM of a Solution prefered by…

A: Here we are required to find the pH of weak base solution.

Q: d) Does DMAP act as a Brønsted or Lewis base?

A: The question is based on the concept of Basicity. We have to explain the nature of DMAP base.

Q: 1. The following is a synthetic amino acid. The pKa values of this synthetic amino acids is given…

A: Since, question to be answered is not specified, we can provide answer of the first question only.…

Q: Consider the following five weak acids: Succinic acid:  pKa = 4.16HOBr:  Ka = 2.06 x…

A: Given weak acids Succinic acid:  pKa = 4.16HOBr:  Ka = 2.06 x 10-9Dinicotinic:  pKa =…

Q: For an acid with a pKa of 5.00, what is the pKb of its conjugate base?

A:

Q: Glutamic acid has three protonatable groups (two carboxyls and one amino). Calculate its isoelectric…

A: Given Molecule  Glutamic acid  pI ( isoelectric point) = To be determined

Q: (a) The isoelectric point (pI) of phenylalanine is pH 5.5. Draw the structure of the major form of…

A: Answer (a):

Q: Phosphoric acid has pka values of approximately 2, 7 and 12. What are the relevant pKa for the…

A: Given, Phosphoric acid has three pKa values. pKa1 = 2 pKa2 = 7 pKa3 = 12