Would HEPES or Tris be a better buff er at pH 7.5?

Q: What is the pH of a solution of 0.12 M of benzoic acid for which PK₁ = 4.20?

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Q: O) For a weak acid with a pKa of 5.5, at what pH would there be a 10-fold excess of the protonated…

A: Since you have asked multiple question, as per our company guidelines we are supposed to answer the…

Q: Calculate the pką of an acid with Ka = 7.77 x 104. %3D A. 3.110 B. 7.160 C. 10.089

A: pKa = 3.110  ----> option(A)

Q: pKa of Cu2+ is 10.7 in aqueous solution. Would you expect the pKa of Cu+ to be higher, lower, or…

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Q: NH,* Glycine = CH,-c00- I liter of 0.1 M glycine. pKa's = 2.34 and 9.6 c. How much 5M KOH is needed…

A: 1.AHA=2.52.1L×0.1molL=0.1mol of gycineAs reaction started concentration of glycine decreases gets…

Q: When BF3 behaves as a Lewis acid, the stability of the adducts with (CH3)2O, (CH3)2S, and (CH3)2Se…

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Q: Draw a diagram (picture) showing the principle species in solution as a function of pH for a mixture…

A: Formic acid dissociates as:   HCOOH↔HCOO-+H+                           (1)pKa,formic acid=3.75

Q: What is the predominant form of EDTA at pH 5?    a. H3Y- b.H2Y2- c.HY3- d. Y4-

A: Full form of EDTA hexa ethylene diammine Tetra acetic acid. PH= 5 means it is Acidic solution . As…

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: 2. 1 M valine is present in 1 liter of water at (a) pH 7.5, (b) pH 2.5. For each functional group,…

A: Valine is a nonpolar amino acid with the uncharged structure shown below:

Q: Phenylalanine is a diprotic acid with pKg = 2.20 for the carboxylic acid group and pK, = 9.31 for…

A: pKa for carboxylic acid group = 2.2 pKa for ammonium group = 9.31

Q: At what pH will 25% of a compound with a pKa of 5.3 be in its basic form?

A: A buffer solution contains both weak acid and the salt of weak acid formed from its conjugate base.…

Q: Calculate the saponification value of a sample of castor oil from the following data: Weight of oil…

A: Saponification value or saponification number (SV or SN) represents the number of milligrams of…

Q: What is the dominant form of arsenic acid (H3A) at pH =9.23 ? Given: pKa1 = 2.24 , pKa2 = 6.96, pKa3…

A: At first equivalence point, pH will be given by: pH=pKa1+pKa22=2.24+6.962=4.6 At this point, the…

Q: 1.What is the lactic acid concentration (in M) of the titrated sample? 2. Determine the lactic acid…

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Q: The pKa values of the carboxylic acid groups of oxaloacetic acid are 2.22 and 3.98.a. Which carboxyl…

A: a. The structure of oxaloacetic acid is; The pKa value is inversely related to the acidic strength…

Q: Guanine, as it would appear at physiological pH, is shown below. One of the pKas of guanine, which…

A: The protonated form at N7 is =NH+- The deprotonated form at N7 is =N- pKa of =NH+ is, pKa = 2.4

Q: A purified protein is in a HEPES (N-(2-hydroxyethyl)piperazine-N-(2-ethanesulfonic acid)) buffer at…

A: Given: concentration of NaCl = 600 mM Since, 1 mL of sample, 600 mM NaCl and HEPES buffer is…

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

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Q: How much monobasic and dibasic phosophate is needed to make 100 mL buffer containing 100 moles of…

A: A buffer solution is solution that is used to maintain the pH of the solution to be constant. A…

Q: 2) A triprotic weak acid H3A has pKa1 = 2.50, pKa2 = 6.70 and pKa3 = 10.30. Calculate the pH of a…

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Q: Explain the difference in the pKa values of the piperidinium and aziridinium ions:

A: pKa is the acid dissociation constant. pKa is used to determine the strength of an acid. if the pKa…

Q: The isoelectric point of a zwitterion with an acidic pKa of 3 and a basic pKa of Select one: O a. 9…

A: Given pKa acidic =3 pKa basic = 6

Q: Given a 0.300 M solution of anserine at its isoelectric point and ready access to 0.100 M HCl, 0.100…

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Q: Given the following alpha fraction plot, what is the pK31 of the polyprotic acid? 1.0000 0.8000…

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Q: Ascorbic acid is a diprotic acid with pKa1 = 4.l and pK2 = 11.8. You have an ascorbate buffer with…

A: Given information,       The pH of the ascorbate buffer is 11.2

Q: If the Ksp of Ca(IO)2 is 4 x 10-9 and the [Ca2+] is found to be 0.001M, then the [103'] is: O 6.5 x…

A: Since you have asked multiple type questions, we will solve only first  questions for you. If you…

Q: If you wish to extract aqueous acetic acid into hexane, is it more effective to adjust the aqueous…

A: Acetic acid is a weak acid which dissociate as  CH3COOH ---------> CH3COO- + H+

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: What are the structures of threonine in each part of its titration curve? Give a clear handwritten…

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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…

A:

Q: At a pH of 10 what is the fraction of EDTA that is in the form Y4-? I got 0.30 but I believe that is…

A: The fraction of EDTA in the form of Y4- is equal to the αY4- value at that pH.

Q: of AgSCN? KSP(AGSCN)=12, PKa(NH.") =9.2 , PKdAg(NH3)**/Ag+=7.2

A: GIVEN :  [H+] = 10^-8.9 Vol of solution = 1/2l  Ksp of AgCN =10^-12 Pka {NH4+] = 9.2 PKa [ Ag(NH3)2]…

Q: Draw the structure of the most abundant form of histidine in solutions whose pH values are 1, 3, 5,…

A: Histidine falls under the category of essential amino acid; it is mandatory to incorporate this…

Q: determine the ph ef sogh of a suffer 6-SM etofi- chloine sul of l,072X106

A: pKa = 5.97 pH = 5.27 Explanation:

Q: Question attached

A: Paper chromatography is a qualitative method in order to detect the presence of colored components.…

Q: The base B has pKb  4.00. Find the fraction in the form B and the fraction in the form BH at pH …

A: a.

Q: Use Pauling’s First and Second Rules to determine the pKa values of bromic acid and selenous acid as…

A: Explanation to the correct answer is given below.

Q: For an acid HA with a pKa of 5.2, what is the ratio of the concentration of the conjugate base to…

A: The dissociation reaction of acid HA can be written as  => HA ------> H+ + A-  Conjugate base…

Q: The pKa values of the carboxylic acid groups of oxaloacetic acid are 2.22 and 3.98. a. Which…

A: a. The structure of oxaloacetic acid is; The pKa value is inversely related to the acidic strength…

Q: Relative Intensity 100 60 40 8 / Find out the functional group 10 20 50 40 50 60 70 1860 my 2000 Wer

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Q: Zn, heat 7- Succinimide

A: Succinimide is an organic compound that possesses the chemical formula of C4H5NO2. It is white in…

Q: appearance of l2(g)?

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Q: What is the complete balanced equation and then the Keq expression for the following: 1.…

A: Answer: Since, Mg is more reactive metal then hydrogen, therefore it will displace, hydrogen from…

Q: a) Identify the type of the followings surfactants. CH3 R-S-o M R-N-CH2CH2-C-o CH3 (ii) (i) b) Which…

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Q: A purified protein is in a HEPES (N-(2-hydroxyethyl)piperazine-N-(2-ethanesulfonic acid)) buffer at…

A: Initial concentration of NaCl solution, Minitial = 600 mM Initial volume taken, Vinitial = 1 mL…

Spectroanalytical Methods

Spectroanalytical methods measure the wavelength and intensity of radiations that are either emitted or absorbed by a molecular or atomic species. These methods are useful for evaluating the electronic or atomic arrangement of the molecules of a given analyte.