Suppose you have a sample of benzoic acid dissolved in water.

b. Now assume that aqueous NaOH is added to the benzoic acid solution until pH 12 is reached. Draw the structure of the major organic species present.

Question

Suppose you have a sample of benzoic acid dissolved in water.

b. Now assume that aqueous NaOH is added to the benzoic acid solution until pH 12 is reached. Draw the structure of the major organic species present.

Accepted Answer

Hi everybody. Our next problem says, imagine you have a solution of proano acid in water. Now, envision that koh potassium hydroxide is gradually mixed into the propo OIC acid solution until the solution reaches a ph of 12 depict the structure of the predominant organic compound in a solution at this ph level. Then we have four different answer choices with different representations of the compound. So let's think about what's going on here. We have pro bono acid which is a carboxylic acid. So that's a weak acid. But in this aqueous solution, we have raised the ph to 12. So it's extremely basic. So essentially our propo OIC acid will be completely in the form where it has given up its hydrogen ion and become propo 08. So let's think about that structure. We have it's prono three carbons, 12, the third is the carbon carbon co double bond and then an oxygen. When it's prono acid, this will be oh but this is going to have given up its hydrogen in the basic environment. And we have three lone pairs and a negative charge on that oxygen. This is a single bond to the carbon carbon in this basic solution, we'll also have our koh well disassociated into K plus and then oh minus which will combine with the hydrogen plus ions to form water. So our potassium ions and our proba noid ions will form an ionic salt. Again at page 12. Basically, all that propo OIC acid will have become propo 08 and combined with the potassium. So let's look at the structures we're given to determine which represents this as a predominant form. In choice. A, we have the structure that I've drawn. We have propo 08 with a negative charge on the oxygen that is single bonded to the carbon carbon and A K plus ion in the aqueous form. So choice A matches what we determine would be the predominant structure. When we look at choice B, it has a negative charge on the carbon oxygen. So the oxygen that is double bonded with the carbon and the potassium ion shown next to that. Well, this would not be the form here. It's our single bodied oxygen that will have the negative charge. This carbon oxygen will have a partially positive charge but it is not going to lose the, it doesn't have a hydrogen to lose in that basic environment. The way the oxygen that's single bonded to that carbon and carbon does. Choice C shows the potassium being added as a covalent bond on to compound. But this would not happen. Our potassium hydroxide is an ionic compound and it will form as potassium ion. And that is the same with choice D which shows the potassium being added as a Cobalt bond. Potassium's a group one, a metal, it's going to lose its electrons completely to become an ion. So once again, our major product will be choice a the salt, potassium prono see you in the next video.

Suppose you have a sample of benzoic acid dissolved in water.

b. Now assume that aqueous NaOH is added to the benzoic acid solution until pH 12 is reached. Draw the structure of the major organic species present.

Verified Solution

Key Concepts

Benzoic Acid

pH and Acid-Base Reactions

Organic Species in Aqueous Solutions

Suppose you have a sample of benzoic acid dissolved in water.b. Now assume that aqueous NaOH is added to the benzoic acid solution until pH 12 is reached. Draw the structure of the major organic species present.

Verified Solution

Key Concepts

Benzoic Acid

pH and Acid-Base Reactions

Organic Species in Aqueous Solutions

Suppose you have a sample of benzoic acid dissolved in water.

b. Now assume that aqueous NaOH is added to the benzoic acid solution until pH 12 is reached. Draw the structure of the major organic species present.