Colorimetry: Why use complementary colour?Watch
I need to know why we use the complementary colour to that of the solution being tested for colorimetry.
Also, are there any units of absorption?
Cheers. +rep as thanks!
So you have a sample in a cuvette, white light is striking the sample and some of it being absorbed. The remaining frequencies are transmitted and are what gives the solution its colour. If a solution is blue, then it is absorbing orange light. By using an orange filter you're only letting orange light hit the sample... so perhaps the sensor sensitivity is somehow improved by only allowing frequencies which will show a level of absorption through. i.e. if all the frequencies(except orange) were hitting it it'd be harder to measure variations.
This is speculation
Using the filter which is a complementary colour to the solution being tested means the only colour of light being absorbed or transmitted by the solution is the one which is most strongly absorbed, making it easier to measure the concentration of the solution.
Before replying to threads, it is worth checking how old they are.
This one was probably last visited when you were still in primary school. Your reply is pretty unlikely to be seen by anyone who was part of it.
Please reply soon.