Suppose you decreased the pH of the biotin solution from 7.0 to 3.0 - what would happen to the ionizable group on a molecule of biotin as the pH shifted from 7.0 to 3.0? Briefly explain why you would expect that to happen

Q: Find the pH of a solution 2.0 M in ethylamine CH3CH2NH2. For CH3CH2NH2 Kb=5.6x10-4. Explain step by…

A:

Q: What is the pH of a 0.360 M solution of C₅H₅NHBr (Kb of C₅H₅N is 1.7 × 10⁻⁹

A: Given data--> C= 0.360 M solution of C5H5NHBr Kb=1.7*10-9   pkb = - log10(1.7*10-9) pkb= 9 -…

Q: Calculate the pH of a 1.01×10-2 M solution of the decongestant ephedrine hydrochloride if the pKb of…

A: Given:Molarity = 1.01×10-2 MpKb of ephedrine = 3.86we need to Calculate the pH.

Q: Calculate the pH of a 0.100 M solution of alanine prepared from the form shown below. pKa (-COOH) =…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: Amphetamine (C9H13N) is a weak base with a pKb of 4.2. a) Calculate the pH of a solution containing…

A: 225 mg/L = 0.225 g/LMolar mass of amphetamine = 135.2 g/molConcentration of amphetamine = given mass…

Q: 2. Calculate [A]/ [HA] ratio of phosphoric acid species presents in blood at pH=7.4. Identify…

A: Henderson Hasselbach equation is used in the preparation of a buffer.  pH = pKa + log [base][acid]…

Q: What is the pOH of a solution that has pH = (8.69x10^0)? Enter your answer in scientific notation…

A:

Q: What is the pH of a 0.0830 M solution of methylamine (CH₃NH₂, Kb = 4.4 × 10⁻⁴)?

A:

Q: Show the reaction and equilibrium expression for the basic dissociation of trimethylamine. Given…

A: The pH is scale for determining the acidity of a solution. If the pH of a solution is below 7 then…

Q: Calculate the acid ionization constant (pKa) for the acid with a 0.775 M solution of a weak acid…

A: Given data of the following:: [weak acid] = 0.775 M = [HA]  pH = 3.38 pka = ?

Q: What is the pH of a 0.420 M solution of C₅H₅NHBr (Kb of C₅H₅N is 1.7 × 10⁻⁹)

A: Given, Concentration of C₅H₅NHBr = 0.420 M Kb = C₅H₅N is 1.7 × 10⁻⁹   pKb=-[logkb]pKb=-[log 1.7 ×…

Q: Calculate the Kb values for the CO32- and C2H3O2- ions using the Ka values for HCO3- (4.7 x 10-11)…

A: We have to find Kb values for the CO32- and C2H3O2- ions using the Ka values for HCO3- (4.7 x 10-11)…

Q: Amphetamine (C,H13N) is a weak base with a pKp of 4.2. You may want to reference (Page) Section 16.7…

A: Given: concentration of amphetamine (C9H13N) = 250 mg/L molar mass of amphetamine = 135.21 g/mol pkb…

Q: Calculate the concentrations of all ionic species in a 0.25 M solution of histidine at pH 6.4.…

A:

Q: What is the acid dissociation constant Ka for its conjugate acid? If the base dissociation constant…

A: Conjugate acid of hypochlorite ion is,

Q: 9. If only 0.9% of 0.50 M solution of a weak base was ionized. Calculate its Kb value? * 1.6 x 104…

A:

Q: Phenylacetic acid (C6H5CH2COOH, simplified here to HPAc is a monoprotic acid. It builds up in the…

A: First write reaction of phenylacetic acid with water and on basis of that reaction, find Ka and pKa…

Q: Calculate the [H3O+][H3O+] of oranges with pH=3.50pH=3.50 .

A: We are having oranges with pH=3.50 pH = - log [H3O+]

Q: a) If the pH value of an aqueous solution of trimethylamine [(CH3)3N] is 10.75, what should be the…

A: Given,  pH of the solution = 10.75 molarity of the solution = ? Kb = 6.3 × 10-5 The balance chemical…

Q: Write the Henderson–Hasselbalch equation for a solution of propanoic acid (CH, CH,CO,H, pKa = 4.874)…

A: In this question, a solution of propanoic acid is given whose pKa value is given. The pH value…

Q: Think about the chemical reactions in which the H⁺-ion is involved. In how many positions can this…

A: The functional group of a molecule furnishes the characteristic chemical reaction and hence the new…

Q: What is the pH of a solution containing 0.30 M CH₃COONa and 0.10 M CH₃COOH? The Ka of CH₃COOH is 1.8…

A:

Q: The figure below shows a fractional composition plot for a weak acid for which the fully protonated…

A: In fractional composition plot of acids, the intersection point depicts the point where pH=pKa

Q: Write down the reaction between [Cr(C2O4)2(H2O)2] and dilute potassium hydroxide.

A: Introduction: [Cr(C2O4)2(H2O)2] is a chromium (|||) complex in which C2O4 oxalate ion has a charge…

Q: The Ka of formic acid (HCHO) is 1.8 x 10^-4. Calculate the pH with a solution that is 0.15 M in both…

A: Given information is as follows; Ka = 1.8×10-4 HCHO  and  KCHO = 0.15 M           Determination of…

Q: From the following list, select all salts that would form an acidic aqueous solution.     LiClO2…

A: For these salts , we would write their dissolution in water and check the strength of acid and base…

Q: The pH of a 0.112 M ethylamine is 11.80. Find by showing your computations the pKb for ethylamine.

A: Given that,  pH of 0.112 M ethylamine solution = 11.80 Since, pH + pOH  = 14             pOH  = 14 -…

Q: Calculate the pH of a 0.2 M solution of an amine that has a pKa of 9.5

A:

Q: A particular solution is 0.05M with respect to ethanoic acid and 0.2M with respect to sodium…

A:

Q: What is the pH of a 0.430 M solution of C₅H₅NHBr (Kb of C₅H₅N is 1.7 × 10⁻⁹)?

A: pH= 1/2(pKb-logc) Here given Kb=1.7×10-9,hence pKb=-logKb=-log(1.7×10-9) given c=0.430 M

Q: A 1.305 g sample of N-2-acetamido-2-aminoethane-sulfonic acid potassium salt (ACES-K+, MW = 220.29…

A:

Q: What percentage of the base is protonated in an aqueous zalcitabine solution containing 655 mg/Lmg/L…

A: The  ratio of the concentration of hydroxide to the initial concentration of B multiplied by 100% is…

Q: How much mL of BaSO4 will be recovered given the following: Solution A: Na2SO4(aq) = 0.01 M; V =…

A:

Q: Calculate the pH for a 0.5 M nitrous acid (HNO2 ) aqueous solution. Ka= 7.1x10-4

A: The acid dissociation constant ( Ka ) for Nitrous acid is given. Ka= 7.1x10-4 [HNO2] = 0.5 M

Q: Write a net ionic equation to show that codeine, C13H21O3N, behaves as a Bronsted-Lowry base in…

A: The chemical equations should be balanced in accordance with the law of conservation of mass. This…

Q: A 1.083 g sample of N-2-acetamido-2-aminoethane-sulfonic acid potassium salt (ACES K*, MW = 220.29…

A:

Q: The normal pH range for blood plasma is 7.35–7.45. Under these conditions, would you expect the…

A:

Q: the pH value of an aqueous solution of trimethylamine [(CH3)3N] is 10.75, what should the molarity…

A: Answer  Calculate molerity C = ?

Q: 15.What would be the pH of a 0.25 M solution of phenylamine (C6H5NH2) at room temperature? The Kb of…

A: Given:  Concentration (C) of C6H5NH2 = 0.25 M Kb = 4 × 10-10 As C6H5NH2 is a weak base   So POH…

Q: Sodium bromide is determined by Fajans-Fisher-Khodakov method. Idicator fluorescein. Accepted pH…

A: PH    = 6.5 - 10.3

Q: provide an explanation of the graphs (a) and (b) the relationship of the biological activity of the…

A: Sulfonamide (also known as sulfa drugs) is the fundamental functional group of more than a few…

Q: Calculating the pH of a weak base solution The base protonation constant K, of morpholine (C,H;ONH)…

A: Given, Kb of morpholine (C4H8ONH) = 2.14 × 10-6 Concentration of morpholine (C) = 1.3 M pH = ? Note:…

Q: What pH would you make the water layer in order to cause both compounds to dissolu Water should have…

A: The pKa is the pH value at which a chemical species will accept or donate a proton. The lower the…

Q: How should the pH of a 0.2 M solution of KC2H3O2 compare to that of a 0.2 M solution of NaC2H3O2?…

A: As we know NaOH is strong base than KOh

Q: Calculate the sodium acetate/acetic acid ratio to prepare a buffered solution with a pH of 5.06.…

A: The ratio can be found by using Henderson-Hasselbach equation: pH = pKa + log[salt][acid]…

Q: Write the reaction  as proton-transfer reactions. Label which reactant is the acid and which is the…

A:

Q: If the pH value of an aqueous solution of trimethylamine [(CH3) 3N] is 10.75, what should be the…

A:

Q: During a cardiac arrest a person stops breathing. One of the first things that a paramedic or the…

A:

Q: NaHCO3 can deprotonate benzoic acid but cannot deprotonate phenol. On the other hand, NaOH can…

A: A compound or a species that can give or donate protons in an aqueous solution is termed an acid.…

Q: Calculate the pOH of a solution that contains 7.802×10‒6 M OH‒ at 25 °C.      a) 5.107…

A: The negative logarithm of the concentration of OH- ions is known as pOH of the solution. For the…

UV Visible Spectroscopy

Spectroscopy refers to the absorption or emission of light or other radiations by matter. When a substance or chemical absorbs light or radiation, they reach an excited state followed by de-excitation or emission of the light or radiation forming distinct spectra. UV-visible spectroscopy or  ultraviolet-visible refers to the absorption and emission in the ultraviolet and visible regions of the electromagnetic spectrum.