Question

The Ka of formic acid is 1.8 x 10-4, the Ka of acetic acid is 1.8 x 10-5 and the Ka of hypobromous acid is 2.8 x 10-9. Which of the following statements is true? The weakest conjugate base is acetate The weakest conjugate base is formate The weakest conjugate base is hypobromite Formic acid is a strong acid Hypobromous acid is a base 

          The Ka of formic acid is 1.8 x 10-4, the Ka of acetic acid is 1.8 x 10-5 and the Ka of hypobromous acid is 2.8 x 10-9. Which of the following statements is true?
The weakest conjugate base is acetate
The weakest conjugate base is formate
The weakest conjugate base is hypobromite
Formic acid is a strong acid
Hypobromous acid is a base
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Added by Juan Jos- G.

Chemistry: Structure and Properties
Chemistry: Structure and Properties
Nivaldo Tro 2nd Edition
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The Ka of formic acid is 1.8 x 10-4, the Ka of acetic acid is 1.8 x 10-5 and the Ka of hypobromous acid is 2.8 x 10-9. Which of the following statements is true? The weakest conjugate base is acetate The weakest conjugate base is formate The weakest conjugate base is hypobromite Formic acid is a strong acid Hypobromous acid is a base
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Transcript

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00:01 So the way that we answer the first one is we have to remember two main tenets.
00:04 So the first thing is that the strongest conjugate base is going to come from the weakest acid.
00:09 So that's our first step in analyzing.
00:12 The second thing is the way that we're going to figure out what the weakest acid is, is we're going to look for whatever the smallest k .a is.
00:19 So we're going to look for the lowest number there.
00:22 Now the first one for formic acid 1 .8 times 10 to the negative 4.
00:26 We know that the negative 4 exponent is greater than both of the next two for acetic and benzoic acids since they've got negative 5 exponents.
00:35 Since both of those have negative 5, we have to look at the starting value.
00:41 6 .3 is greater than 1 .8, meaning that the smallest k .a.
00:45 That we have here is 1 .8 times 10 to the negative 5, which is acetic acid...
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