Investigating the rate of reaction between
Rates of reaction graphs: rsc.
Samples are taken with a pipette at regular intervals during the reaction, and titrated with standard hydrochloric acid in the presence of a suitable indicator. It is the arguments I am most interested in developing after students complete their data analysis.
What is our dependent variable?
These holes should securely hold the glass tubes and vertically in the plastic container. There are two different ways this can be accomplished. I facilitated the design of the experiment by asking my students a series of questions that were meant to feel like it was a genuine conversation happening between scientists interested in answering a question.
Record the temperature of the reaction mixture. Leave the vial to warm up for about 3 minutes.
Investigating the rate of reaction between sodium thiosulphate and hydrochloric acid temperature
This time, the temperature is changed between experiments, keeping everything else constant. This is an approximation of the reaction rate in the interval; it does not necessarily mean that the reaction has this specific rate throughout the time interval or even at any instant during that time. It is the arguments I am most interested in developing after students complete their data analysis. The PowerPoint that I used to help facilitate this discussion can be found as Supporting Information at the bottom of this post if you are logged in to ChemEd X, but the general theme followed these questions: What is our independent variable? Suppose the experiment is repeated with a different lower concentration of the reagent. You can use these to help students understand the effect of concentration on the rate of reaction. The table of concentrations and times is processed as described above. It is acting as a catalyst. Two holes should be made in the lid using a hot wide cork borer. This technique is known as a back titration. This was discussed in some detail in an earlier article. The rate of this reaction can be monitored by measuring the time taken for a fixed amount of sulfur to be produced.
This table shows the approximate temperatures for five experiments.
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