3 Consider images A and B below, and then answer the following questions:ABa. Which image better represents the solution formed when MgCl₂ is dissolved in water? Explain your choice.b. Which image better represents the solution formed when OCl2 is dissolved in water? Explain your choice.c. Which solution would produce a precipitate upon addition of AgNO3? Explain.

1. Part (a): Which image better represents the solution formed when MgCl₂ is dissolved in water?…

Answered: 3 Consider images A and B below, and…

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter2: Life, Chemistry, And Water

Section: Chapter Questions

Problem 11TYK

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7. · In the space provided, sketch a titration curve (pH vs H+ ions dissociated) of a phosphate buffer shown below. The pKa of H2PO4 is 7.0. H,PO, НРО, + 9. 8. 7 pH 3 1.0 0.5 H+ dissociated --> b. What is the effective buffering range of this acid? At what pH will you have 25% of the buffer in the form of H2PO4? с.
1. Sketch the general shape of the titration curve for the addition of hydroxide to phosphoric acid all the way to phosphate. 2. Given the cellular pH, which chemical species are present in the cell? Label the relevant weak acid and conjugate base 3. For the relevant equilibrium present in the cell, sketch the titration curve. Make sure the following are labeled: The x and y axes. The relevant pKa. The endpoint. The buffer zone. The point at which there is a 50/50 mixture of weak acid and conjugate base. The relative amounts of the weak acid and conjugate base (use the specific chemical species you determined in part 3) along each segment of the titration curve
B, C The equations are in the other page. Thanks
1. Adding as little as 0.1 ml of concentrated HCl to a liter of H20 shifts the pH from 7.0 to 3.0. Adding the same amount of HCl to a liter of a solution that 0.1 M in acetic acid and 0.1 M in sodium acetate, however, results in a negligible change in pH. Why do these two solutions respond so differently to the addition of HCI?
2. Mixtures of amino acids can be analyzed by first separating the mixture into its components through ion-exchange chromatography. Amino acids placed on a cation-exchange resin containing sulfonate (-SO₁) groups flow down the column at different rates because of two factors that influence their movement: (1) ionic attraction between the sulfonate residues on the column and positively charged functional groups on the amino acids, and (2) hydrophobic interactions between amino acid side chains and the strongly hydrophobic backbone of the polystyrene resin. For each pair of amino acids listed, determine which will be eluted first from the cation-exchange column by a pH 7.0 buffer. (a) Asp and Ly, (b) Arg and Met, (c) Glu and Val, (d) Gly and Leu, (e) Ser and Ala
2. Imagine you have 3 different crystals and 3 agar gel plates (Agar is a gel used in microbiology preparations). The crystals and their molecular weight is given below. If you place same amount of solution into a hole made in your agar gel plate and wait an hour the crystals will diffuse (see figure 1). a. Methylene blue (molecular weight (MW) is 319.85 g/mol); b. Potassium permanganate (MW is 158.03 g/mol); c. Nigrosin (MW is453.5 g/mol) Explain possible explanations for the differences noted among the diffusion rates of the three chemicals.
3. A buffer was prepared by dissolving 15 grams if ammonium chloride in 100mL solution prepared by diluting 15mL of concentrated ammonia [28% by mass with a density of 1.00 g/mL] to make 100mL solution of dilute ammonia. a. What is the pH of the buffer solution? b. What will be the change in pH if 10mL of 0.005M HCl is added to 25mL of this buffer solution? c. What will be the change in pH if 10mL of 0.005M NaOH is added to 25mL of this buffer?
1. Draw an approximate titration curve for lysine, given that its pKa(COOH) = 2.18, its pKa(NH3*) = 8.95, and its pka(R) = 10.53. a. What pH ranges would Lys be a good buffer at? b. What is the pl of Lys? C. Draw the structures of the predominant species in solution at (i) pH 0, (ii) pH 7, (iii) pH 9.5, (iv) pH 12.
Choose among proteins A, B, C, and D. 1. Protein that will most strongly bind to an anion exchange colum. 2. Protein that will elute last in gel filtration chromatography. 3. Protein that will elute first in hydrophobic interaction chromatography. 4. Protein that will elute last in a carbohydrate containing colum.
1. What volumes of 50 mM CH3COOH and 30 mM NaCH3CO0 solutions are needed to prepare 2L of 20 mM acetate buffer pH 3.6? (pka for acetic acid is 4.74)
1. Calculate the pH of a buffer solution made from 0.20 M CH3COOH and 0.50 M CH3COO- that has an acid dissociation constant for CH3COOH of 1.8 x 10-5.
! ( please give ans with explanation)

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