pKa Values of Acids - Organic Chemistry

TL;DR

This video discusses the relationship between PKA values and acid strength, highlighting how electronegativity and atomic size affect acid strength.

Transcript

in this video we're going to talk about the pka values of acids if you're studying for your first semester of organic chemistry any preparing for the first exam likely you're going to be tested on assets and bases and to really know if an acid if one acid is stronger than another it really helps to know the pka values and that's what we're going to... Read More

Key Insights

• 🗯️ Acid strength increases as you move to the right on the periodic table due to electronegativity, and it also increases as you move down due to atomic size.
• 😘 PKA values are inversely related to acid strength, with lower PKA values indicating stronger acids.
• 🫀 Electronegative atoms can lower the PKA value of a compound and increase its acid strength.
• 💪 Aromatic systems can also lower the PKA value of a compound, making it a stronger acid.
• 😘 Protonated forms of alcohols and ethers have lower PKA values, indicating stronger acidity.
• 😘 Amines with positive charges on nitrogen have lower PKA values than their neutral forms.
• 🪜 Adding aromatic systems to amines can significantly decrease their PKA values.
• 😘 Carboxylic acids with electron-withdrawing groups have lower PKA values and are stronger acids.

Questions & Answers

Q: How does acid strength change as you move to the right on the periodic table?

Acid strength increases as you move to the right on the periodic table due to the increase in electronegativity of the elements.

Q: What is the relationship between PKA values and acid strength?

The lower the PKA value of an acid, the stronger it is. PKA values are inversely related to acid strength.

Q: How does atomic size affect acid strength?

Acid strength increases as you move down on the periodic table due to the increase in atomic size, which stabilizes the conjugate base.

Q: How does adding electronegative atoms or aromatic systems affect acid strength?

Adding electronegative atoms or aromatic systems to compounds can significantly lower the PKA value, making them stronger acids.

Summary & Key Takeaways

• Acid strength increases as you move to the right on the periodic table due to electronegativity, and it also increases as you move down due to atomic size.

• The lower the PKA value of an acid, the stronger it is.

• Adding electronegative atoms or aromatic systems to compounds can significantly lower the PKA value.