Calculate the pH of a 6.9 × 10 -5 °M aqueous solution of hydrochloric acid (HCI). Round your answer to 2 decimal places.

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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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**Transcription for Educational Use:**

**Title: Calculating the pH of a Hydrochloric Acid Solution**

**Objective:**

Learn how to calculate the pH of a hydrochloric acid (HCl) solution with a given molarity.

**Problem Statement:**

Calculate the pH of a \( 6.9 \times 10^{-5} \, M \) aqueous solution of hydrochloric acid (HCl).

Round your answer to 2 decimal places.

**Answer Input Box:**

- [Answer Box]

**Function Buttons:**

- A button with an "X" signifies 'Clear Input.'
- A button with a circular arrow signifies 'Reset Calculation.'
- A button with a question mark signifies 'Help or Hint.'

**Instructions:**

1. Recall the formula for pH calculation: 

   \[
   \text{pH} = -\log[\text{H}^+]
   \]

   For strong acids like HCl, the concentration of H⁺ ions is equal to the molarity of the acid because HCl dissociates completely in water. 

2. Substitute the given molarity of \( 6.9 \times 10^{-5} \, M \) into the pH formula to find the pH value.

3. Use a scientific calculator to compute the logarithm and determine the pH.

4. Enter the calculated pH in the answer box and round to two decimal places.

**Note:**

Ensure you understand the basic log functions and how to use your calculator for logarithmic calculations. If necessary, use the hint button for additional guidance on using the calculator.
Transcribed Image Text:**Transcription for Educational Use:** **Title: Calculating the pH of a Hydrochloric Acid Solution** **Objective:** Learn how to calculate the pH of a hydrochloric acid (HCl) solution with a given molarity. **Problem Statement:** Calculate the pH of a \( 6.9 \times 10^{-5} \, M \) aqueous solution of hydrochloric acid (HCl). Round your answer to 2 decimal places. **Answer Input Box:** - [Answer Box] **Function Buttons:** - A button with an "X" signifies 'Clear Input.' - A button with a circular arrow signifies 'Reset Calculation.' - A button with a question mark signifies 'Help or Hint.' **Instructions:** 1. Recall the formula for pH calculation: \[ \text{pH} = -\log[\text{H}^+] \] For strong acids like HCl, the concentration of H⁺ ions is equal to the molarity of the acid because HCl dissociates completely in water. 2. Substitute the given molarity of \( 6.9 \times 10^{-5} \, M \) into the pH formula to find the pH value. 3. Use a scientific calculator to compute the logarithm and determine the pH. 4. Enter the calculated pH in the answer box and round to two decimal places. **Note:** Ensure you understand the basic log functions and how to use your calculator for logarithmic calculations. If necessary, use the hint button for additional guidance on using the calculator.
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