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Worksheet about chemistry lab lesson | ||
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| Subject: Chemistry | ||
| 11th Grade | ||
| Term 1 | ||
| Year: 2023/2024 | ||
| Size: 384.1KB | ||
| Number of clicks: 151 | ||
| Publish date:November 06, 2023 | ||
| Added by: Eman | ||
| Last download date: 2024-09-07 02:33:31 | ||
| Updated by: Eman9966 on 2023-11-06 07:36:40 | By: theodor Bielga Espaillat | |
| File info: Info Objective: The objective of this lab is to introduce students to the concept of acid-base titration and to develop their skills in performing volumetric analysis. Materials:- Burette - Pipette - Conical flask - Phenolphthalein indicator - Sodium hydroxide solution (NaOH) - Sulfuric acid solution (H₂SO₄) - Distilled water - Safety goggles - Lab coat - pH indicator paper Procedure:1. Safety Precautions: - Put on safety goggles and a lab coat to protect yourself from any potential hazards. - Ensure that the work area is clean and organized. 2. Preparation of Solutions: - Prepare a standardized solution of sodium hydroxide (NaOH) by dissolving a known mass of NaOH in distilled water. Stir the solution until the solid is completely dissolved. - Similarly, prepare a standardized solution of sulfuric acid (H₂SO₄) by dissolving a known quantity of H₂SO₄ in distilled water. Stir well. - Label the solutions appropriately. 3. Setting up the Burette: - Rinse the burette with distilled water to remove any impurities. - Fill the burette with the sodium hydroxide solution, ensuring that there are no air bubbles trapped in the burette tip. - Record the initial volume (the initial reading on the burette). 4. Titration: - Using a pipette, transfer a known volume of sulfuric acid solution (the analyte) into a clean conical flask. - Add a few drops of phenolphthalein indicator to the conical flask. The indicator will change color when the reaction is complete. - Slowly add the sodium hydroxide solution from the burette into the conical flask while stirring continuously. - Continue adding the sodium hydroxide solution drop by drop until the indicator changes color permanently. - Record the final volume (the final reading on the burette). 5. Calculation and Analysis: - Calculate the volume of the sodium hydroxide solution used in the titration. - Use the balanced chemical equation and stoichiometry to determine the molar ratio between the acid and base. - Calculate the concentration of the sulfuric acid solution. 6. Clean-up: - Dispose of the chemicals and solutions properly according to your teacher's instructions. - Clean and dry the glassware for future use. Discussion and Conclusion: - Discuss the results obtained and the calculations made. - Relate the experiment to the concepts of stoichiometry, acid-base reactions, and volumetric analysis. - Emphasize the importance of accurate measurements and proper technique in titration experiments. This lab lesson provides students with hands-on experience in performing acid-base titrations, which is an essential skill in analytical chemistry. It also reinforces concepts of chemical reactions, stoichiometry, and concentration calculations. Additionally, it emphasizes the importance of safety precautions and proper lab techniques in conducting experiments. | ||
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