Objective
Determine how the concentration of reactants affects the rate of a chemical reaction.
Materials
- Sodium thiosulfate
- Hydrochloric acid (HCl)
- Graduated cylinders
- Beakers
- Stopwatch
- Notebook for observations
Instructions
- Prepare different concentrations of sodium thiosulfate by diluting with water.
- Measure a specific volume of hydrochloric acid for each reaction.
- Add hydrochloric acid to the sodium thiosulfate solution and start the stopwatch.
- Observe and record the time it takes for the solution to turn cloudy.
- Repeat the experiment with different concentrations of sodium thiosulfate.
- Compare the reaction rates at different concentrations and draw conclusions about the effect of concentration on reaction rate.