Which molecule has the lowest pk₂? (Your answer may include more than one of the choices if the molecules shown have the same value.) U ■ A A B 00 U H H B 'S-H H you C
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- c) Which of the following phenolic compounds has the lowest pKa value? Explain. co HO, но ÓH B AProvide the approximate pK, of the following and indicate the most acidic hydroge (a) CH3-NH-CH3 (b) CH3-C=CH (c) CH3-COOH (d) CH3-CH2-OHArrange the following compounds in decreasing order of acidity * |- CICH2CH2CH2COOH Il - CH3CH2CHCICOOH III – CH3CHCICH2COOH III > I> || O I > II > || O I > I| > II III > || >|
- Rank the following molecules according their acidity. (1 = lowest pka) OEt O 요 ii iiNet il 요 NEt₂ O O CF 3 Predict how the highest pka from question 9 compares with the lowest pka from question 8.The pK, values of acids A-C are 9.0, 9.1, and 9.2. Match OH ОН OH each of these values with its structure. CI Br A ВPart B Benzoic acid is a weak acid that has antimicrobial properties. Its sodium salt, sodium benzoate, is a preservative found in foods, medications, and personal hygiene products. Benzoic acid dissociates in water: C6H5 COOH(aq) + H₂O(1) C6H5COO- (aq) + H3O+ (aq) -1 The pK₂ of this reaction is 4.2. In a 0.66 mol L-¹ solution of benzoic acid, what percentage of the molecules are ionized? Express your answer to two significant figures and include the appropriate units.
- List H1 to H5 as their pKa values from lowest to highest. Explain the reason.Thioglycolic acid, HSCH2CO2H, a substance used in depilatory agents (hair removers) has pKa = 3.42. What is the percent dissociation of thioglycolic acid in a buffer solution at pH = 3.0?The following pKa values have been measured. Explain why a hydroxyl group in the para position decreases the acidity while a hydroxyl group in the meta position increases the acidity.