Which molecule has the lowest pK₂? (Your answer may include more than one of the choices if the molecules shown have the same value.) H H C A B A B H H C H H
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- Two pk, values are reported for malonic acid, a compound with two COOH groups. Explain why one pk, is lower and one pk, is higher than the pKa of acetic acid (CH;COOH, pKg = 4.8). ple HO malonic acid HO, Но pk = 2.86 pk = 5.70An acid with a low pKa:Provide 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-OH
- Match each of the following pk, values (3.2, 4.9, and 0.2) to the appropriate carboxylic acid: (a) CH;CH,COOH; (b) CF3COOH; (c) ICH;COOH.Which has the highest pKa? O a carboxylic acid (RCOOH) O a hydrocarbon (ie, an alkane) O a mineral acid (ie, HCI) O an alcohol (RO-H)Part 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.
- Which of the compounds have the lowest pKA, why?Arrange the following compounds in decreasing order of acidity * |- CICH2CH2CH2COOH Il - CH3CH2CHCICOOH III – CH3CHCICH2COOH III > I> || O I > II > || O I > I| > II III > || >|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?