ChatterBank0 min ago
Refractive Index of Water
My experiment title is "the affects that dissovled substances have on the refractive index of water"
I chose to slowly add salt to a sample of water, systematically measuring the refractive index of the water at each step. I used the "apparent depth" method, where a traveling microsope is used to focus firstly on the base of a beaker, secondly on the surface of water when it is added to the beaker and thirdly on the new apparent position of the base of the beaker (through the water). By noting the scale of the microscope at each focus you can find the value of n.
I successfully managed to find the value of n for water, the only problem is that when i add salt the change in n is too small to measure. (my error is greater than my variable).
Does anyone have any suggestions?
Are their any substances that will alter the refractive index of water enough to measure it?
Any help will be greatly appreciated as I am drastically running out of time.
Many Thanks,
Jamie
Answers
No best answer has yet been selected by perrrelet. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.Not sure what your guideline / remit is, but what about two miscible liquids? eg ethanol and water. Miscible in all proportions, so you can go from 100% H2) to 100% ethanol* (well, as high a percentage as the materials available).
Oh, and one small, possibly pedantic point - you are looking for the effects of a dissolved substance.
(A may well affect B, but you attempt to measure the effect)
It won't look good if you make that mistake in the title - the first thing your marker / examiner will see.
Hand held refractometers are used to measure the concentration of anti-freeze in car coolant - you could try that.
Would you believe there's even a refractometer shop
http://www.refractometershop.com/
Where you can buy things like calibration fluids
Remember though that as the magnification of a microscope increases it's depth of field reduces so you want to use the highest magnification ou can get to get the smallest depth of field and the most accurate focus point.
maple syrup refractometer
hand held refractometer
atc refractometer
brix meter
https:/
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