How Concentration Affects Rate of Reaction
Ever wondered why some chemical reactions happen in the blink of an eye while others take ages? The answer often lies in concentration. When we increase the concentration of reactants, more particles are packed into the same space, creating more collisions between particles.
In this practical, you'll measure how quickly a reaction happens at different concentrations. You might use a gas syringe or an inverted measuring cylinder to collect gas produced when acid reacts with magnesium ribbon. Alternatively, you might time how quickly a cross disappears when sodium thiosulfate reacts with hydrochloric acid.
The results consistently show that higher concentrations lead to faster reaction rates. This happens because more particles in the same volume means more frequent collisions between reactants.
Top Tip: When answering exam questions about this practical, focus on potential errors like timing issues or not controlling variables properly. Remember that everything except concentration should remain constant!
Your measurements need to be precise - whether you're recording gas volume or timing how quickly a solution becomes cloudy enough to obscure a cross drawn under a flask.
