Solution Found!
Indicate whether a carboxylic acid (RCOOH) with a pKa of
Chapter 2, Problem 38P(choose chapter or problem)
a. Indicate whether a carboxylic acid \((\mathrm{RCOOH})\) with a \(p K_{a}\) value of \(4.5\) will have more charged molecules or more neutral molecules in a solution with the following \(p H\):
1. \(p H=1\) 3. \(p H=5\) 5. \(p H=10\)
2. \(p H=3\) 4. \(p H=7\) 6. \(p H=13\)
b. Answer the same question for a protonated amine with a \(p K_{a}\) value of \(9\).
c. Answer the same question for an alcohol \((R O H)\) with a \(p K_{a}\) value of \(15\).
Equation Transcription:
Text Transcription:
(RCOOH)
pK_a
4.5
pH
pH=1
pH=3
pH=5
pH=7
pH=10
pH=13
9
(ROH)
15
Questions & Answers
QUESTION:
a. Indicate whether a carboxylic acid \((\mathrm{RCOOH})\) with a \(p K_{a}\) value of \(4.5\) will have more charged molecules or more neutral molecules in a solution with the following \(p H\):
1. \(p H=1\) 3. \(p H=5\) 5. \(p H=10\)
2. \(p H=3\) 4. \(p H=7\) 6. \(p H=13\)
b. Answer the same question for a protonated amine with a \(p K_{a}\) value of \(9\).
c. Answer the same question for an alcohol \((R O H)\) with a \(p K_{a}\) value of \(15\).
Equation Transcription:
Text Transcription:
(RCOOH)
pK_a
4.5
pH
pH=1
pH=3
pH=5
pH=7
pH=10
pH=13
9
(ROH)
15
ANSWER:Solution 38P
Step 1 of 3:
Here, we are asked to indicate if the given compound with a given pKa value will have more charged molecules or more neutral molecules in a solution for given pH values.
If the pH value of the solution is lesser than the pKa value, then it exists in its acidic form and will have more neutral molecules.
If the pH value of the solution is greater than the pKa value, then it exists in its basic form will have more charged molecules.
a.
Given Compound: carboxylic acid (RCOOH) with a pKa of 4.5.
A carboxylic acid is neutral in its acidic form (RCOOH) and charged in its basic form (RCOO-).
Hence, a Carboxylic acid at pH = 1 and pH =3 with a pKa of 4.5 has more neutral molecules(RCOOH). A Carboxylic acid at pH = 5,7,10 and 13 with a pKa of 4.5 has more charged molecules(RCOO-).