1. Draw the structural formula of the amino acid valine that predominates in solution at each of the following pH values. А. рH 3D 7.0 В. рH%3D 12.0 C. pH = 2.0

Q: 1.The specific rotation of a sample of mandelic acid [PhCH(OH)CO2H] is -9.48° and of pure S-(-)-…

A: Multiple questions are asked by you. I will answer the first question which has 3 subparts, as per…

Q: 1- Using the pH 12 of the buffer and the pKa = 12.32. What is the molar ratio of A- to HA.  2- What…

A: Given Values: pH of the buffer = 12 pKa value of the weak acid = 12.32 Molarity of the buffer = 0.2…

Q: 3. Consider the following amino acid: HS. он NH2 a. Draw this structure in a solution of potassium…

A: Introduction The given amino acid is Homocysteine. In a basic solution, the carboxyl group is…

Q: A. What is the pH of a 0.15 M solution of acetic acid?

A: The pH of a solution is a measure of its acidity or basicity. It is a scale from 1-14. A lower value…

Q: 1. Determine whether each of the following statements describes the primary, secondary, tertiary, or…

A: 1.a peptide bond is the back bone of the protein chain. It is the amide linkage in which COOH of one…

Q: 6. Label instructions for an ampicillin product call for the addition of 75 mL of water to make 100…

A: Adding a diluent, such as purified water or other liquid, per package directions, to a powder to…

Q: 3. A buffer was prepared by dissolving 15 grams if ammonium chloride in 100mL solution prepared by…

A: Given, In 100 ml solution 15 g NH4Cl is dissolved (Molar mass of NH4Cl = 53.5 g/mol) = (15/53.5)…

Q: 2. What concentration of H (aq) corresponds to each of the following? pH = 10.92 РОН %3D4.32 РОН %3D…

A: pH is the measure of the strength of H+ ion or Hydronium ions in solution. pH at which 50%…

Q: 2. Draw the structural formula of the amino acid asparagine that predominates in solution at each of…

A: Asparagine is a polar amino acid. It contains one amide group in its side chain which is not…

Q: 2. Four unidentified solutions of equal concentration (0.1 mol/L) were prepared by chemistry…

A: The acidity of a solution is dependant on the concentration of protons or hydronium ions in the…

Q: 1. If I make a solution by adding 83 grams of sodium hydroxide (NaOH) to water to give 750 mL of…

A: Number of moles (mol) = Mass (g) / Molar Mass (g/mol)Concentration (g/L) = Mass (g) / Volume…

Q: 4. Read the absorbance at 595nm of the blank and test solutions. Calculate the protein concentration…

A: Bradford method of protein assay is a method used for the determination of the concentration of…

Q: The concentration of acetic acid (pKa = 4.75) in vinegar is about 1.0 M. What is the pH of vinegar?

A: The pH of a solution is defined as the negative logarithm of the H3O+ ion concentration in moles per…

Q: 1. Using Hydrophobic interaction chromatography, the protein that will be eluted FIRST is

A: Hydrophobic interactions  are one typeof bonding interactions that are present between water and…

Q: 4) The result above occurred because the potassium permanganate crystals have a weight than the…

A: As per our company's guidelines we are supposed to answer a single at a time, please repost the rest…

Q: 6. Of the following pairs write which ones could be used as buffers and why: (a) 0.1 M NaOH and 0.1…

A: A buffer is defined as an aqueous chemical solution that resists a change in its pH or acidity. It…

Q: 1. Shown below is the chromatogram for some amino acid standards and two unknowns. Each unknown…

A: Hi! Thanks for your question. As you have posted multiple questions and have not mentioned which…

Q: 1. How many molecules of NaCl are there in a 50.0 g sample of NaCl? The molecular weight of NaCI is…

A: Note: We are authorized to answer one question at a time since you have not mentioned which question…

Q: The weak acid HA is 2% ionized (dissociated) in a 0.20 M solution. (a) What is Ka for this acid? (b)…

A: The dissociation of a weak acid in water occurs as follows: HA ⇄ H⁺ + A⁻ Ka = [H⁺] [A⁻] / [HA]

Q: _7. Which of the following FA has the lowest melting point? A. Stearic acid B. Palmitic acid C.…

A: A fatty acid is a molecule that is composed of a long hydrocarbon chain attached to the carboxylic…

Q: 1. Please draw the given peptide and calculate the net charge at pH 1, 4, 8 and 12. GRNVGHEWA

A: A peptide can be defined as a short chain of amino acids. They are connected to each other by a…

Q: For a weak acid with a pKa of 6.0, calculate the ratio of conjugate base to acid at a pH of 5.0

A: The Henderson-Hasselbalch equation helps to describe the derivation of pH as a measure of acidity in…

Q: 20 mL solution is 2 M NaOH. If 0.5 M HCl is to be added to this solution, calculate the pH of the…

A: pH is the negative logarithm of hydrogen ion, used to measure the acidity and basicity of the…

Q: 1. What class of biomolecules does this compound belong to? Explain why. 2. Break this compound down…

A: A biomolecule is any of the numerous substances that are produced by the cells and living organisms.…

Q: 2. 60ml of a 0.2M solution of tetrapeptide Cys-Met-Arg-Asp is adjusted to pH=8. The solution is then…

A: Peptides are composed of acidic and basic groups with varying pKa values . Hence we introduce acids…

Q: 2.) An unknown amino acid was subjected to paper chromatography with five amino acid standards in…

A: For Thin layer chromatography, we define Retension factor (Rf) as ratio of distance travelled by…

Q: 6.All of the following types of interactions cooperate in stabilizing the tertiary structures of…

A: Tertiary structure of protein is three dimensional structure of protein which is formed by single…

Q: One liter of a 0.1 M Tris buffer (pKa of Tris = 8.3, see Table 2.4) is prepared and adjusted to a pH…

A: Given Values: pKa of tris = 8.3 pH of the buffer = 2.0

Q: 1. What is acid indigestion? How is it treated, and explain how the treatment works. 2. What would…

A: “Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: 4. Which of the following would be considered a basic solution? A. Solution with [OH-] = 3.8 x 10 M…

A: We can find out this using formula pH + pOH = 14 pOH = -log[OH-] and pH = -log [H+]

Q: QUESTION: What are the buffer regions/effective pH range?

A: Buffer solution is a solution which pH does not varies on dilution or addition of small amount of…

Q: The salt of diclofenac, a nonsteroidal anti-inflammatory drug (NSAID), has a chemical formula…

A: Diclofenac is a non-steroidal anti-inflammatory, an analgesic drug used to relieve pain and swelling…

Q: 10. It was found that At coordinates to a metal in a 4:1 stoichiometry. Noting that A has a ba…

A: Biological important of coordination compounds like the heme group, which is Fe-Porphyrin complex…

Q: How many mL of distilled water must be added to make the Benzalkonium chloride preparation isotonic

A: Calculate in next step

Q: 2. Fill in the blank: Identify the type of non-covalent/covalent interactions present in the…

A: The Ramachandran plot is a graph plot between phi (φ) and psi (ψ) the torsional angles of the…

Q: 1. A solution containing polymer of an unknown structure, and with an approximate molar mass of 1.75…

A: Osmotic pressure can be defined as the minimum pressure that must be applied to halt the flow of…

Q: 7. Which of the following is a valid buffer? A. 0.30 M HNO, and 0.30M NANO, B. 0.20 M HF and 0.10 M…

A: Buffers are solutions that do not alter pH when diluted or when tiny volumes of acids or alkalis are…

Q: 1. The K, of acid HX is 2.0 x 10 NaX is a salt that produces its conjugate base X What is the pH of…

A: Given Values: Ka value of [HA] = 2.0 × 10-6  pKa = - log Ka = - log 2 × 10-6 = 6 - log 2 = 6 -0.30 =…

Q: e configuration of a protein molecule? Provide an exam

A: Protein characteristics are determined not only by the sequence of amino acid residues in…

Q: 5. You need the following standard protein concentrations: 4mg/mL, 1mg/mL, 0.25mg/mL, and…

A: Proteins are nitrogenous organic macromolecules that are essential for the proper functioning of…

Q: 6. Draw each of the following amino acids in the ionic form that predominates at pH 7. Show all…

A: Amino acids are colorless crystalline substances made up of carbon, nitrogen, hydrogen, and oxygen.…

Q: 3. How will you prepare 500 ml of 0.750 M citrate buffer with pH of 4.25 from solid citric acid…

A: Given Values: The volume of the buffer = 0.5 L or 500 ml The concentration of citrate buffer = 0.75…

Q: If the pKa of a carboxyl group in a protein is approximately 4.5, at pH 5.5 the ratio of carboxylate…

A: pH at which 50% acid dissociate called its pKa. Buffer solutions often are weak…

Q: (c) The i-motif structure requires a pH of between 4.2 and 5.2. (i) Explain, using chemical…

A: DNA is a polymer of nucleotides present in the cells of living beings.

Q: A certain weak acid, HA, with a K, value of 5.61 x 10-6 is titrated with NAOH. Part A A solution is…

A: pH is defined as negative logarithm of hydronium ion concentration.pH=-log[H3O+]. In a titration, a…

Q: 3) Give three examples of where we find proteins in our bodies. a. b. с. Draw the structural formula…

A: Proteins are made up of amino acids. The amino acids are the building block of proteins, and…

Q: 1. The hydropathic index represents the sum of hydrophobic and hydrophilic residues of a…

A: Proteins are one among the 4 macromolecules that makes up all forms of cellular life. Proteins are…

Q: 1. Draw the structural formula of the amino acid serine that predominates in solution at each of the…

A: Serine is also a polar amino acid. It contains a hydroxyl group in its side chain, which is…