Questions: This assignment will help you to learn the following skills and knowledge: - Determine the acid-base properties of ions and salts from Ka and Kb values of parent compounds 1. Determine whether each anion is basic or neutral. For basic anions, write equations showing how the anion acts like a base. a. C7 H5 O2^- c. I^- Neutral Neutral b. NO3^- d. F^- Basic Basic

This assignment will help you to learn the following skills and knowledge: - Determine the acid-base properties of ions and salts from Ka and Kb values of parent compounds 1. Determine whether each anion is basic or neutral. For basic anions, write equations showing how the anion acts like a base. a. C7 H5 O2^- c. I^- Neutral Neutral b. NO3^- d. F^- Basic Basic
Transcript text: This assignment will help you to learn the following skills and knowledge: - Determine the acid-base properties of ions and salts from $\mathrm{K}_{\mathrm{a}}$ and $\mathrm{K}_{\mathrm{b}}$ values of parent compounds 1. Determine whether each anion is basic or neutral. For basic anions, write equations showing how the anion acts like a base. a. $\mathrm{C}_{7} \mathrm{H}_{5} \mathrm{O}_{2}^{-}$ c. $\mathrm{I}^{-}$ Neutral Neutral b. $\mathrm{NO}_{3}{ }^{-}$ d. $\mathrm{F}^{-}$ Basic Basic
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Solution

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Solution Steps

Step 1: Determine the Acid-Base Properties of Anions

To determine whether an anion is basic or neutral, we need to consider the parent acid from which the anion is derived. If the parent acid is a strong acid, the anion is typically neutral. If the parent acid is a weak acid, the anion can act as a base.

Step 2: Analyze Each Anion
a. Anion: \(\mathrm{C}_{7} \mathrm{H}_{5} \mathrm{O}_{2}^{-}\)
  • Parent Acid: Benzoic acid (\(\mathrm{C}_{7} \mathrm{H}_{6} \mathrm{O}_{2}\))
  • Acid Strength: Weak acid
  • Conclusion: The anion \(\mathrm{C}_{7} \mathrm{H}_{5} \mathrm{O}_{2}^{-}\) is basic.

Equation: \[ \mathrm{C}_{7} \mathrm{H}_{5} \mathrm{O}_{2}^{-} + \mathrm{H}_2\mathrm{O} \rightleftharpoons \mathrm{C}_{7} \mathrm{H}_{6} \mathrm{O}_{2} + \mathrm{OH}^{-} \]

b. Anion: \(\mathrm{NO}_{3}^{-}\)
  • Parent Acid: Nitric acid (\(\mathrm{HNO}_{3}\))
  • Acid Strength: Strong acid
  • Conclusion: The anion \(\mathrm{NO}_{3}^{-}\) is neutral.
c. Anion: \(\mathrm{I}^{-}\)
  • Parent Acid: Hydroiodic acid (\(\mathrm{HI}\))
  • Acid Strength: Strong acid
  • Conclusion: The anion \(\mathrm{I}^{-}\) is neutral.
d. Anion: \(\mathrm{F}^{-}\)
  • Parent Acid: Hydrofluoric acid (\(\mathrm{HF}\))
  • Acid Strength: Weak acid
  • Conclusion: The anion \(\mathrm{F}^{-}\) is basic.

Equation: \[ \mathrm{F}^{-} + \mathrm{H}_2\mathrm{O} \rightleftharpoons \mathrm{HF} + \mathrm{OH}^{-} \]

Final Answer

  • a. \(\mathrm{C}_{7} \mathrm{H}_{5} \mathrm{O}_{2}^{-}\): \(\boxed{\text{Basic}}\)
  • b. \(\mathrm{NO}_{3}^{-}\): \(\boxed{\text{Neutral}}\)
  • c. \(\mathrm{I}^{-}\): \(\boxed{\text{Neutral}}\)
  • d. \(\mathrm{F}^{-}\): \(\boxed{\text{Basic}}\)
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