Calculate pH for a weak acid/strong base titration. Determine the pH during the titration of 59.5 mL of 0.436 M nitrous acid (K₂ = 4.5x10-4) by 0.436 M NaOH at the following poin (a) Before the addition of any NaOH (b) After the addition of 15.0 mL of NaOH (c) At the half-equivalence point (the titration midpoint) (d) At the equivalence point (e) After the addition of 89.3 mL of NaOH

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**Title: Calculating pH for a Weak Acid/Strong Base Titration**

**Objective:**
Determine the pH during the titration of nitrous acid by sodium hydroxide at various points.

**Experiment Details:**

- **Initial Solution:**
  - Volume: 59.5 mL
  - Concentration: 0.436 M nitrous acid 
  - Acid dissociation constant, \( K_a = 4.5 \times 10^{-4} \)

- **Titrant:**
  - Concentration: 0.436 M NaOH

**Titration Points:**

(a) **Before the addition of any NaOH:**  
   Calculate the initial pH of the nitrous acid solution.

(b) **After the addition of 15.0 mL of NaOH:**  
   Determine the pH after adding a specified volume of the base.

(c) **At the half-equivalence point (the titration midpoint):**  
   Calculate the pH when half of the acid is neutralized.

(d) **At the equivalence point:**  
   Determine the pH when the amount of base added completely neutralizes the acid.

(e) **After the addition of 89.3 mL of NaOH:**  
   Find the pH after adding more base than needed to reach the equivalence point.
Transcribed Image Text:**Title: Calculating pH for a Weak Acid/Strong Base Titration** **Objective:** Determine the pH during the titration of nitrous acid by sodium hydroxide at various points. **Experiment Details:** - **Initial Solution:** - Volume: 59.5 mL - Concentration: 0.436 M nitrous acid - Acid dissociation constant, \( K_a = 4.5 \times 10^{-4} \) - **Titrant:** - Concentration: 0.436 M NaOH **Titration Points:** (a) **Before the addition of any NaOH:** Calculate the initial pH of the nitrous acid solution. (b) **After the addition of 15.0 mL of NaOH:** Determine the pH after adding a specified volume of the base. (c) **At the half-equivalence point (the titration midpoint):** Calculate the pH when half of the acid is neutralized. (d) **At the equivalence point:** Determine the pH when the amount of base added completely neutralizes the acid. (e) **After the addition of 89.3 mL of NaOH:** Find the pH after adding more base than needed to reach the equivalence point.
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