The image displays a table required for calculating the theoretical mass percent of water in a hydrate using two different methods. Each section of the table allows for the work to be displayed for each calculation. **Table Columns:** - **Method**: Indicates the specific calculation method for determining the mass percent of water. - **Show Work**: An area is provided for detailed calculations. **Rows:** 1. **Theoretical mass percent of water in a hydrate (Eq.1.2)** 2. **Mass of hydrate in sample, \( g \) (Eq.1.5)** This setup aids in understanding how to derive the percentage of water in a hydrate sample using specified equations, requiring students to demonstrate their calculation processes. The bottom right of the image is marked with a page number: 6. **Educational Resource: Hydrate Analysis** **Title:** Determination of Water Content in a Hydrate **Objective:** This experiment aims to analyze the water content in a copper(II) sulfate pentahydrate (CuSO₄·5H₂O) sample through heating. **Unknown Sample Number:** A **Chemicals in Unknown Mixture:** CuSO₄·5H₂O and SiO₂ **Hydrate Formula:** CuSO₄·5H₂O **Molar Mass of the Hydrate:** 249.55 g/mol --- **Data Collection:** **1. Mass of Crucible (after Pre-heating):** - Mass = 11.393 g **2. Mass of Crucible and Unheated Sample:** - Mass = 12.845 g - *Observation:* Bright blue color **3. Mass of Unheated Sample:** - Calculation: 12.845 g - 11.393 g = 1.452 g **4. Mass of Crucible and Sample after 1st Heating:** - Mass = 12.497 g **5. Mass of Crucible and Sample after 2nd Heating:** - Mass = 12.494 g - *Difference between 1st and 2nd heating:* 0.003 g **6. Mass of Water Lost (g):** - Calculation: Mass before heating - Mass after heating - 12.494 g - 11.393 g = 1.101 g - 1.452 g (unheated mass) - 1.101 g = 0.351 g - *Conclusion:* 0.351 g of water was lost as gas. --- **Instructions for Teachers:** - Use this data to illustrate the process of determining the water content in a hydrate. - Discuss the methodology, emphasizing accurate measurement and the importance of heating to constant weight. **Discussion Points:** - Explain why multiple heatings are necessary to ensure all water is removed. - Discuss the significance of using a bright color observation, indicating the presence of water. **Activities:** - Calculate the percentage of water in the hydrate. - Compare the experimental percentage to theoretical values. **Conclusion:** This experiment helps students understand the composition of hydrates and how to quantify the water content based on mass loss during heating.