RP3: How Rate Of Reaction Changes With Temperature
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What are some hazards in this experiment?
Dilute HCL Sodium thiosulfate Heating liquids
How are we going to reduce the risk of dilute HCL?
. Use the lowest concentration possible . Use the smallest volume possible
How are we going to reduce the risk of sodium thiosulfate?
. Use smallest volume or lowest concentration possible . Avoid exposure to released gasses e.g. sulfur dioxide by using fume cupboards
How are we going to reduce the risk of heating liquids?
. Wear eye protection . Do not heat directly over a naked flame . Use a test tube holder to handle boiling tubes or tongs to handle conical flasks.
What is the independent variable in this experiment?
Temperature of sodium thiosulfate and hydrochloric acid.
What is the dependant variable in this experiment?
Time taken for cross to disappear.
What is the control variable in this experiment?
. Volume of reactants . Concentration of reactants
What is the method for this RP?
• Measure 10 cm³ of 0.2 mol dm⁻³ hydrochloric acid and 10 cm³ of sodium thiosulfate into separate clean measuring cylinders. Place each into separate boiling tubes. • Select a temperature to investigate. Use a water bath to bring both solutions to that temperature by placing the boiling tubes in the bath. • Place a conical flask on a sheet of paper with a black cross drawn on it. • Add the sodium thiosulfate to the flask first, then quickly add the hydrochloric acid. Start the stopwatch immediately and swirl to mix. • Stop the stopwatch when the cross beneath the flask is no longer visible, and record the time. • Repeat the experiment for four other temperatures (up to a maximum of 70 °C).