QQuestionChemistry
QuestionChemistry
4. The COOH group is called a carboxylic acid group. The second oxygen helps to stabilize the conjugate base after the hydrogen leaves by sharing the increased electron density. This makes it easier to break the O-H bond. Draw the following three Lewis structures, HCOOH, H^2CO^3 and CH^3OH. Which of the structures would make for the strongest acid, and which would result in the weakest acid? Justify your response in a sentence below the structures you draw.
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Step 1:: Draw the Lewis structure for HCOOH (formic acid).
Formic acid, HCOOH, has a total of 12 valence electrons (6 from the C atom, 1 from the H atom, and 5 from the two O atoms). To draw the Lewis structure, follow these steps:
Step 2:
Place the H atom in the center, as it is the least electronegative atom.
Step 3:
Add the C atom, then add the two O atoms around the C atom.
Step 4:
Distribute the remaining electrons to form a total of 8 electrons around each atom (4 electron pairs, 2 bonding and 2 non-bonding). The Lewis structure for HCOOH is: \begin{array}{ccccc} \mathrm{H} & - & \mathrm{C} & - & \mathrm{O} \ & & | & & \ & & : & & : \end{array}
Step 5:: Draw the Lewis structure for H^2CO^3 (carbonic acid).
Carbonic acid, H^2CO^3, has a total of 24 valence electrons (6 from the C atom, 2 from the two H atoms, and 6 from the three O atoms). To draw the Lewis structure, follow these steps:
Step 6:
Place the two H atoms in the center, as they are the least electronegative atoms.
Step 7:
Add the C atom, then add the three O atoms around the C atom.
Step 8:
Distribute the remaining electrons to form a total of 8 electrons around each atom (4 electron pairs, 2 bonding and 2 non-bonding). The Lewis structure for H^2CO^3 is: \begin{array}{ccccc} \mathrm{H} & - & \mathrm{C} & - & \mathrm{O} \ & & | & & \ & & \mathrm{O} & & \ & & | & & \ \mathrm{H} & - & \mathrm{O} & & \end{array}
Step 9:: Draw the Lewis structure for CH^3OH (methanol).
Methanol, CH^3OH, has a total of 16 valence electrons (4 from the C atom, 1 from the H atom, and 6 from the O atom). To draw the Lewis structure, follow these steps:
Step 10:
Place the H atom in the center, as it is the least electronegative atom.
Step 11:
Add the C atom, then add the three H atoms around the C atom.
Step 12:
Add the O atom around the C atom.
Step 13:
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Final Answer
- Strongest acid: HCOOH (formic acid) - Weakest acid: CH^3OH (methanol)
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