_Chemistry Lab Safety Data Sheets and Post-Lab Complete

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Chemistry

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Jun 14, 2024

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Chemistry Lab Safety EXERCISE 1: IDENTIFYING COMMON LABWARE Data Sheet Table 1. Common Labware and Their Uses Item What is it Used For? Beaker Used for mixing solutions. Graduated Cylinder Used for measuring precise volumes of liquids. Pipette Used to measure and transfer small volumes of liquid. Ring Stand Used to clamp another labware item. Test Tube Clamp Holds a piece of labware, such as a test tube or flask, on a ring stand. Erlenmeyer Flask Used as a reaction vessel in experiments involving heating liquid mixtures. Test Tube Used to hold small volumes of liquid chemicals and other mixtures. Weigh Boat Used to hold powders on a scale. Mortar and Pestle Used to crush solid substances into powder. Syringe Used to deliver precise amounts of liquid to a solution at a desired rate. Stopcock Affixes to a syringe to control the addition rate of a liquid to a solution. Metal Spatula Used to transfer solids to powders. Glass Stir Rod Used to mix solid powders in liquids. Digital Scale Used for taking measurements of mass. ©2019, eScience Labs

Chemistry Lab Safety Exercise 1 Post-Lab Questions 1. Name each of the images of labware below: a. b. c. d. e. ©2019, eScience Labs 1. Erlenmeyer Flask 2. Mortar and Pestle 3. Pip ett 4. Graduated Cylinder 5. Be ak

Chemistry Lab Safety 2. What would you use to measure 6.5 mL of a liquid? - A graduated cylinder. 3. What would you use to measure 3.5 g of a dry powder? Include all pieces of necessary labware. - A weigh boat and a digital scale. 4. What would you use to transfer a solid carboxylic acid from a weigh boat to a test tube? - A metal spatula. 5. What would you use to transfer a liquid alcohol from its container to a test tube? - A pipette. ©2019, eScience Labs

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Chemistry Lab Safety EXERCISE 2: READING A SAFETY DATA SHEET Data Sheet Table 2. Safety Data Sheet for 10% Phosphoric Acid Information SDS Entry Chemical Formula Water 90% Phosphoric Acid 10% First Aid Procedures If you feel unwell, seek medical advice. After inhalation: Allow victim to breathe fresh air and rest. Immediately call a poison center or doctor/physician. After skin contact: Remove/take off all contaminated clothing. Rinse skin with water. Call a poison center. After eye contact: Rinse with water for several minutes. Remove contact lenses. Continue rinsing. Call a poison center or physician. After ingestion: Rinse mouth. Do not induce vomiting. Call a poison center. Routes of Exposure Skin and eye contact. Signal Words Danger GHS Pictogram(s) GHS05 Environmental Precautions Prevent entry to sewers and public waters. Notify authorities if liquid enters sewers or public waters. Spill Cleanup Procedures Soak up spills with inert solids such as clay or diatomaceous earth. Collect spillage. Store away from other materials. Table 3. Safety Data Sheet for Petroleum Ether Information SDS Entry Autoignition Point 288C (550F) Storage Store in a cool, dry well-ventilated location, away from any area where the fire hazard may be acute. Outside or detached storage is preferred. Storage and use areas should be NO Smoking areas. Isolate from incompatible substances. Potential Health Effects (eye) Vapors may cause irritation. Splashes may cause redness and pain NFPA Flammability Extremely flammable liquid and vapor. NFPA Health Inhalation may cause symptoms of intoxication and peripheral nerve disorders and central nervous system depression. Ingestion may cause local irritation with burning sensation in mouth, esophagus, and stomach. Vomiting, blurred vision, and ©2019, eScience Labs

Chemistry Lab Safety Information SDS Entry diarrhea may occur. Skin contact: may cause irritation. Eye contact: vapors may cause irritation. Chronic exposure: can cause drying and cracking of skin. Fire-Fighting Measures Fire: extremely flammable liquid and vapor. Vapor may cause flash fire. Contact with strong oxidizers may cause fire. Explosion: above flash point, vapor-air mixtures are explosive within flammable limits noted above. Sensitive to static discharge. Fire Extinguishing Media: Dry chemical, foam or Carbon Dioxide. Water may be ineffective. Do not let water runoff enter sewers or waterways. Special Information: In the event of a fire, wear full protective clothing and NIOSH approved self-contained breathing apparatus. Synonyms Ligroin, VM&P Naphtha, Benzin, Petroleum Naphtha, Naphtha ASTM, Petroleum Spirits, Petroleum ©2019, eScience Labs

Chemistry Lab Safety Exercise 2 Post-Lab Questions 1. Which of the above chemicals would you expect to react with a metal? - 10% Phosphoric Acid. 2. Which of the above chemicals would not be stored in a plastic container? - 10% Phosphoric Acid. 3. Describe the importance of proper PPE as it relates to the chemicals above. - Proper PPE is important because it prepares you for safety and health risks. Proper PPE also gives you extra protection in the event of any kind of accident. ©2019, eScience Labs

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Chemistry Lab Safety EXERCISE 3: NEUTRALIZATION Data Sheet Table 4. Initial pH Test Results Container Chemical Contents Initial pH Additional Observations A 5 mL of water 7 Green color, means it is neutral. B 10 mL of 1 molar hydrochloric acid 1 Dark red color, means it is an acid. C 0.5 g of sodium bicarbonate and 100 mL of water 9 Dark green color, means it is a base. Table 5. Neutralization of Acid Total Amount of NaHCO 3 Added Beaker C pH after adding acid 0.5 (initial solution) 4 1.0 5 1.5 7 ©2019, eScience Labs

Chemistry Lab Safety Exercise 3 Post-Lab Questions 1. Most of the chemicals included in your kit can be discarded down a drain with copious amounts of water. Describe a situation in which you would need to neutralize a chemical before discarding down a drain. - If a chemical is a strong acid or base, it would need to be neutralized before discarding down a drain. 2. Why should you add acid to water rather than add water to acid when preparing solutions? - You should add acid to water rather than add water to acid because if you add water to an acid, the heat generated can cause the water to boil, which can cause the acid to splatter all over the place. There is less of a chance of the acid splashing when adding the acid to water. 3. At what point was the solution in beaker C neutralized? - The solution in beaker C was neutralized after adding 1.5 grams of sodium bicarbonate. 4. Address the following scenarios: a. If a more concentrated initial solution of sodium bicarbonate was used in beaker C, would it require more or less bicarbonate to neutralize the acid? Why? - If a more concentrated initial solution of sodium bicarbonate was used in beaker C, it would require less bicarbonate because of its concentrated solution. b. If a less concentrated initial solution of sodium bicarbonate was used in beaker C, would that solution require more or less bicarbonate to neutralize the acid? Why? - If a less concentrated initial solution of sodium bicarbonate was used in beaker C, it would require more bicarbonate due to its concentrated solution. ©2019, eScience Labs