The first possible source of error is the assumption that [OH-] does not change over the course of the experiment, even if it does. However, because the order of magnitude of [OH-] is so large compared to [CV], this error is tiny. Another possible error is inaccuracies in the spectrometer and in the calculation of the order of OH-, in measuring the initial concentrations of the reactants. Although these sources of error likely contributed to slight differences in concentration, they were consistent and small enough to have minimal impact on the order calculation, as demonstrated by the extremely high R2 values ​​(R2 > 0.999) for the natural values ​​plot logarithm of absorbance vs