**Experiment 4: Determination of Water Hardness Using EDTA Titration****Objective:**To calculate the hardness of a water sample through titration with EDTA.**Procedure:**5. A student titrated a 25.00 mL sample of water with 0.0100 M EDTA. The titration required 16.40 mL of EDTA. a. **Calculate the moles of EDTA used.** b. **Calculate the moles of hardness in the water sample.** c. **Calculate the moles of hardness per liter of water.** d. **Calculate the ppm hardness in the water sample.****Instructions:**- **Part a:** Use the formula \( \text{moles} = \text{molarity} \times \text{volume (L)} \) to calculate the moles of EDTA. - **Part b:** Since EDTA forms a 1:1 complex with the hardness ions, the moles of hardness in the water sample will equal the moles of EDTA used.- **Part c:** Convert the moles of hardness to a per liter basis to find concentration.- **Part d:** Calculate the parts per million (ppm) based on the molar mass of the hardness ions, typically calcium carbonate, using the formula ppm = \( \frac{\text{mass of solute (mg)}}{\text{volume of solution (L)}} \).

Mole is the amount of the substance that contains the same number of particles or atoms or…

5. A student titrated a 25.00 mL sample of water with 0.0100 M EDTA. The titration required 16.40 mL of EDTA. a. Calculate the moles of EDTA used. b. Calculate the moles of hardness in the water sample. с. Calculate the moles of hardness per liter of water. d. Calculate the ppm hardness in the water sample.

5. A student titrated a 25.00 mL sample of water with 0.0100 M EDTA. The titration required 16.40 mL of EDTA. a. Calculate the moles of EDTA used. b. Calculate the moles of hardness in the water sample. с. Calculate the moles of hardness per liter of water. d. Calculate the ppm hardness in the water sample.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

**Experiment 4: Determination of Water Hardness Using EDTA Titration**

**Objective:**
To calculate the hardness of a water sample through titration with EDTA.

**Procedure:**

5. A student titrated a 25.00 mL sample of water with 0.0100 M EDTA. The titration required 16.40 mL of EDTA.

a. **Calculate the moles of EDTA used.**

b. **Calculate the moles of hardness in the water sample.**

c. **Calculate the moles of hardness per liter of water.**

d. **Calculate the ppm hardness in the water sample.**

**Instructions:**

- **Part a:** Use the formula \( \text{moles} = \text{molarity} \times \text{volume (L)} \) to calculate the moles of EDTA.

- **Part b:** Since EDTA forms a 1:1 complex with the hardness ions, the moles of hardness in the water sample will equal the moles of EDTA used.

- **Part c:** Convert the moles of hardness to a per liter basis to find concentration.

- **Part d:** Calculate the parts per million (ppm) based on the molar mass of the hardness ions, typically calcium carbonate, using the formula ppm = \( \frac{\text{mass of solute (mg)}}{\text{volume of solution (L)}} \).

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