6. In the following reaction, identify the base: HCO, (aq) + OHaq) = CO3? (aq) + H2O1) ANone of the others BH2O 7. Which of the following is the weakest acid? • HF (Ka for HF is 7.2 x 10–5) • HCN (K, for HCN is 4.9 x 10-1º) None of the others BH3BO3 |HCNO . НЗВОЗ (К, for HaВOs is 2.3 x 10%0) • HCNO (K, for HCNO is 2 x 1024) OHF DHCN

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Chapter1: Chemical Foundations
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**6. In the following reaction, identify the base:**

HCO₃⁻ (aq) + OH⁻ (aq) ⇌ CO₃²⁻ (aq) + H₂O (l)

Options:
- A: None of the others
- B: H₂O (l)
- ✅ C: CO₃²⁻ 

**7. Which of the following is the weakest acid?**

- HF (Kₐ for HF is 7.2 x 10⁻⁵)
- HCN (Kₐ for HCN is 4.9 x 10⁻¹⁰)
- H₃BO₃ (Kₐ for H₃BO₃ is 2.3 x 10³⁰)
- HCNO (Kₐ for HCNO is 2 x 10²⁴)

Options:
- A: None of the others
- B: H₃BO₃
- C: ✅ HF
- D: HCN
- E: HCNO

**Explanation:**

In Question 6, the base is identified as CO₃²⁻ because it accepts a hydrogen ion during the reaction.

In Question 7, HF is identified as the weakest acid because it has the highest Kₐ value (7.2 x 10⁻⁵) among the given acids, indicating it is the least dissociated.
Transcribed Image Text:**6. In the following reaction, identify the base:** HCO₃⁻ (aq) + OH⁻ (aq) ⇌ CO₃²⁻ (aq) + H₂O (l) Options: - A: None of the others - B: H₂O (l) - ✅ C: CO₃²⁻ **7. Which of the following is the weakest acid?** - HF (Kₐ for HF is 7.2 x 10⁻⁵) - HCN (Kₐ for HCN is 4.9 x 10⁻¹⁰) - H₃BO₃ (Kₐ for H₃BO₃ is 2.3 x 10³⁰) - HCNO (Kₐ for HCNO is 2 x 10²⁴) Options: - A: None of the others - B: H₃BO₃ - C: ✅ HF - D: HCN - E: HCNO **Explanation:** In Question 6, the base is identified as CO₃²⁻ because it accepts a hydrogen ion during the reaction. In Question 7, HF is identified as the weakest acid because it has the highest Kₐ value (7.2 x 10⁻⁵) among the given acids, indicating it is the least dissociated.
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