What is the pH of 0.1 M HCN solution? (K, for HCN = 6.2 × 10-10) А. 1.5 В. 1.0 С. 5.1 D. 8.9 Е. 7.5 The table below shows the pH range and color changes of three indicator. What colors would each of these indicators be in the solution described in the question 16? Indicator pH range color at low pH color at high pH (i)Bromophenol blue 3.0-4.6 Yellow Blue (ii) Methyl red 4.2-6.3 Red Yellow (iii)Phenolphthalein 8.3-10 Colorless Pink (iii) (i) A. yellow В. blue C. yellow (ii) red colorless yellow pink red pink D. blue colorless colorless Е. blue red-yellow colorless To find the concentration of HCl solution, 10.0 mL solution is titrated with 0.1 M 25.0 mL of NaOH. What is the concentration of HCl according to the titration? А. 0.50 M В. 0.25 М C. 0.10 M D. 2.50 M Е. 1.00 М

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Micelles and Biological Membrane

Micelles are the type of lipid molecules that organize themselves in spherical shape in aqueous solutions. The production of the micelle is a reply to the amphipathic behavior of fatty acids. It means that they consist of both hydrophobic regions and hydrophilic regions. In micelles, polar head groups (hydrophilic groups) produce an outer layer associated with water whereas nonpolar tails (hydrophobic groups) are organized in the interior.