I need to find the rate law of a reaction but ive only done so when factors cancel out, this one has all different numbers and im not quite sure what to do with it.
It has time taken every second (which im assuming are the different trials) and different concentrations of OH- .. also under the two concentrations they have data for Abs and ln(abs).. which again i am assuming is absolute value and the ln of absolute value but i don't know how to use this information to find the rate law. Ive only ever solved when it has Trails, data for [1], for [2], and the r initial (M/sec)
To find the rate law for a reaction with different concentrations and experimental data, you can follow these steps:
1. Determine the reaction order with respect to each reactant:
- Look at the concentration of OH- and the corresponding rate at different trials.
- Based on the data, determine how the concentration of OH- affects the rate of the reaction. If the rate doubles when the OH- concentration doubles, it is first order. If the rate quadruples when the concentration doubles, it is second order.
2. Determine the overall reaction order:
- Once you have determined the individual reactant orders, add them together to obtain the overall reaction order. For example, if the reaction is first order with respect to OH- and second order overall, the rate law would have a form of rate = k[OH-]^1[A]^2 (where [A] represents the concentration of another reactant, if any).
3. Use the data for Abs and ln(Abs):
- The Abs stands for absorbance, which is a measure of how much light a solution can absorb. In many cases, absorbance is directly related to the concentration of a substance.
- By plotting the ln(Abs) against time, you can determine the order of the reaction with respect to the absorbance. The slope of the line on the graph will give you the order of the reaction with respect to Abs.
4. Confirm the rate law:
- After determining the rate law using both concentration and absorbance data, you should compare the results from both methods. The orders obtained from both approaches should be consistent.
Remember to always perform multiple trials and to collect enough data points to ensure accuracy.