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What is the property of Al(OH)3 which, when reacting with organic dyes, serves as confirmatory test?
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- 0.2 mL of 1% azide was added to 0.2 mL of 1% dye. What is the concentration of the dye now?The following flow chart outlines an acid/base extraction of two compounds. Identify which compound corresponds to each letter G - L. Match the appropriate structure number to the corresponding letter box. Possible answers 1- 7 are given in the bank below the flow chart; some maybe used more than once and not all may be used.Why is the pKa value of protonated hydroxylamine (6.0) so much lower than the pKa value of a protonated primary amine such as protonated methylamine (10.7)?
- 1.95 grams of ethanolamine were dissolved in water, and the pH of the solution was adjusted with HCl until 62% of the molecules were in their protonated (conjugate acid) state. The pKa of ethanolaminium (the conjugate acid of ethanolamine) is 9.5. What is the pH of the final solution? Round your answer to one decimal place (e.g., 2.3) using standard rounding conventions for the last digit.If I have a weak acid with a pKa of 4.65 what will be the relative ratio of [A-] to [HA] in the final mixture be to give a pH of 4.00? What if you change this to a pH of 3.00? 5.00?Explain the reactions involved in separation of p-nitroaniline from mixture contain 3 components 1.Benzoic acid (acidic nature pKa=4.17) 2.Naphthalene (neutral compound) 3.paraNitroaniline(basic compound pKa=12.99
- A) Phenol Red is a weakly acidic dye which is yellow in the HA form and red in the A form. What concentration of Phenol Red is required to obtain an absorbance of 0.50 at 550 nm at pH 7.8? Note: ε550 of A = 2.5 x 104 M-1 cm-1; ε550 of HA = 0; pKa = 7.8. B) What would the absorbance of the solution in part (a) be if the pH was 8.8?reaction: NaHCO3(aq) + HCl(aq) ® NaCl(aq) + CO2(g) + H2O(l) How would your results be affected if the residue in the beaker wasn’t completely dry?What is the role of Glycerin in the assay of Boric Acid?I. The reagent prevents the formation of pink color earlier than the expected endpoint.II. The reagent allows the reaction of protons from the acid sample with the hydroxyl ions from the titrant.III. It enhances the water solubility of the difficultly soluble boric acid. a. I, II & III b. II & III c. I & II d. I only e. I & III