ONCAMPUS Achieve more. UFP Chemistry for Life Sciences: Practical Lab Academic Year 2023-24 Student name ID number Time allowed Instructions Information to candidates 2 hours laboratory time • • • • • • Listen carefully to instructions from the staff members and you should stop immediately if asked to do so. You should work safely at all the time and wear appropriate clothing and safety equipment. If you need help or any additional equipment raise your hand up. Scientific Calculators are allowed. Dictionaries (except electronic ones) are allowed. Before you do your practical, your teacher will explain what you are going to do and might carry out a demonstration - you are advised to listen carefully and take notes. Your teacher will tell you the deadline to submit your lab report. Your lab-report should be submitted through Turnitin (see Assignment Brief for full details) Only use this paper to prepare your lab report which must be done electronically and submitted through Turnitin You must draw your results graph by hand as part of the lab experiment which will be verified by your tutor When including your graph in your lab report submission, this can either be a scan/photo of your hand drawn graph or reproduced electronically using Excel/appropriate software Your Tutor can provide you with graph paper if required INTRODUCTION Temperature and rate of reaction The effect of temperature on rates of reaction. In this experiment the effect of temperature on the rate of reaction between sodium thiosulfate and hydrochloric acid is investigated. When sodium thiosulfate solution is reacted with acid (corrosive), a precipitate of sulfur forms along with a by-product of sulphur dioxide (toxic fumes). The time taken for a certain amount of sulfur to form is used to indicate the rate of the reaction. The effect of temperature on the rate of reaction can be investigated. Before you start work: Na25203 10 40ml • Read all instructions carefully 12 8:00 ひ HC • Write an equipment list from the method below Write a risk assessment and safety precautions Prepare a suitable table to record your data. Method: 1. Measure 10cm³ of sodium thiosulfate and pour it into a conical flask. Mixing 2. Dilute with 40cm³ of distilled water and swirl to mix. Hal 3. Measure 5 cm³ of dilute hydrochloric acid in a small measuring cylinder. 4. Warm the thiosulfate solution in the flask (if necessary) to bring it to the required temperature. (There should be 5 temperatures between 15-60°C) 5. Put the conical flask over a piece of paper with a cross printed on it نفر هامها وقد لام 6. Pour the acid into the flask. START the clock, SWIRL the flask once. 7. Take the initial temperature of the mixture. 4 8. Look down at the cross from above. When the cross disappears, stop the clock and note the time taken. Record the final temperature of the mixture in the flask. ncneed it. Page 2 of 3 10. As soon as possible, pour the solution down the sink (in the fume cupboard if possible) and wash away. 11. 12 11. Repeat the experiment for the other 4 temperatures. 12. Plot a line graph of average temperature against 1/time for each temperature. Hand in your table of results to your tutor. Temperature 820, 30, 40, 50, 60 (°C) نع عليه Temperature and rate of reaction Temp (°C) 20 1202 seconds 332 Time (sec) 60 Rate Time 5:33in 374 (1/time) (sec) 332 30 40 50 60 180 seconds 3:00 1:40 min 100 60 38 secands 180 J 100 38 0.005 Gol 0.0 0102631 time 90.012 when we incres the temperature it & disppear faster Cress 01030 01027 0.024 01021 0.018 Rade time 15 "Gols 0.012 04009 9006 0.003 Temperature and rate of reaction 30 10 20 30 XX 40 50 60 Temperature c/n