I came across a deal on a nice handheld refractometer a while back and bought it to use in brewing, but I'm finding it super helpful in verifying purity of solvents extracted/distilled from consumer products. Basically I'm finding out that vigreux columns are pretty limited.
That's interesting. I thought they work as good as it is told in the labs. I also tested a small sample of selfmade chloroform and found out that it was quite far from pure, even after distillation.
If Alpha T is critical angle of sample liquid then how total internal reflection can occur because there is denser reflecting prism in front of rarer liquid sample
Hi, this was confusing indeed. The refracting prism has a refractive index larger than the sample. Therefore, the critical angle is the angle from which on total internal reflection would occur IF THE LIGHT WAS COMING FROM THE PRISM TO THE SAMPLE. However light is coming from the sample to the prism (and the behaviour of rays is the same if we invert direction) so the same critical angle is the angle of the cone of vision from the prism. Picture the famous fish looking up from water. Light with grazing incidence on the water gets refracted to the fish's eye at the critical angle. Beyond that angle the fish does not see any light coming from the air.
Sorry I made a mistake. Search on google Lorentz - Lorentz equation of molecular refractivity, table of atomic refractivity of Eisenlohr. Not parachor.
I have found a book, 100% readable on google books. books.google.it/books?id=UnaAKa6CP7IC&pg=PA8&lpg=PA8&dq=atomic+refractive+eisenlohr+table&source=bl&ots=HIq02-xes7&sig=Ms1MI9evhVB81NjVY2RtsSYgu30&hl=it&sa=X&ved=0ahUKEwi74uqQv_HVAhUJRhQKHX46Cb4Q6AEIZTAN#v=onepage&q&f=true
It's a polish manufacturer called PZO. This model is RL2, but they don't have any information about it on their page. The oldest manual they have is about the RL3, which seems to be quite similar, but they're selling the RL4 today.
YOU SHOULD HAVE USED PLASTIC DROPPER TO PROTECT PRISMS FROM SCRATCHING WHY IS IT IMPORTANT TO GET "X" IN BETWEEN LIGHT AND DARK ? HOW DO YOU GET RI OF GEMS ?
The prisms are generally made of fused silica or quartz, and both of those are harder than glass, so it's unlikely that you will scratch the prism with a Pasteur pipette, as they are made from very soft glass. He answers your first question at about 1:10. For gems you use a different instrument, often a laser refractometer. Source: I am a glass chemist.
Alpha t is the critical angle of total reflection. When the angle of the light hitting the surface of the refracting prism gets to alpha t and above it, the light is reflected completely. If it's below alpha t the light is transmitted through the surface.
How can light be reflected back to liquid from a refracting prism because a refracting prism is denser than a sample liquid.... And total internal reflection only takes place when there is a rarer medium in front ... Please 🙏 Ans
thanks a lot. love from a student of NIT Goa
I came across a deal on a nice handheld refractometer a while back and bought it to use in brewing, but I'm finding it super helpful in verifying purity of solvents extracted/distilled from consumer products. Basically I'm finding out that vigreux columns are pretty limited.
That's interesting. I thought they work as good as it is told in the labs. I also tested a small sample of selfmade chloroform and found out that it was quite far from pure, even after distillation.
Thanks so much,, you just gave me a head start,,,
I appreciate this
Thanks!! we use this in determining refractive index of minerals in geology
Thank you for this upload. It helped a lot.
I bought a refractometer because of this video.
Haha. It can be pretty useful! :D
very helpful . from Pakistan
You're welcome! :)
thank you for explaining❤
An Abbe refractometer is an instrument to determine the index of refraction of a liquid between two high-index glass prisms.
nice its been some time since i used this great piece of equipment thou
Thank you, nice video
Nice information
refractometer ka scale nhi dikh rha he kya problm ho skti he??
Is the extra additiin of water will change the result?
I want to know if i can use it for a thin piece of glass
What is name of the liquid that use in reflectometer?
If Alpha T is critical angle of sample liquid then how total internal reflection can occur because there is denser reflecting prism in front of rarer liquid sample
Hi, this was confusing indeed. The refracting prism has a refractive index larger than the sample. Therefore, the critical angle is the angle from which on total internal reflection would occur IF THE LIGHT WAS COMING FROM THE PRISM TO THE SAMPLE. However light is coming from the sample to the prism (and the behaviour of rays is the same if we invert direction) so the same critical angle is the angle of the cone of vision from the prism. Picture the famous fish looking up from water. Light with grazing incidence on the water gets refracted to the fish's eye at the critical angle. Beyond that angle the fish does not see any light coming from the air.
thanks. Do you know that by density and refractive index you can investigate the structure of a compound ?
I have only read that you can guess some of the funtional groups due to a high or low refractive index. Or are there other methods?
Random Experiments International there are ! Search for Eisenlohr equation, molar refractivity, parachor on Google
Sorry I made a mistake. Search on google Lorentz - Lorentz equation of molecular refractivity, table of atomic refractivity of Eisenlohr. Not parachor.
I have found a book, 100% readable on google books. books.google.it/books?id=UnaAKa6CP7IC&pg=PA8&lpg=PA8&dq=atomic+refractive+eisenlohr+table&source=bl&ots=HIq02-xes7&sig=Ms1MI9evhVB81NjVY2RtsSYgu30&hl=it&sa=X&ved=0ahUKEwi74uqQv_HVAhUJRhQKHX46Cb4Q6AEIZTAN#v=onepage&q&f=true
may i know what is the goal for the experiment you show ?
Can i measure ri of starch n caco3 non coated with abbe refractometer??
كيف يمكن الحصول على الجهاز وهل يستخدم ضوء الشمس ام ضوء الصوديوم
This vid is great but every time he says "determined" another year is cut off from my life
That's a lot of years... I'm sorry.
@@RaExpIn Don't be, I'm thankful
What is the manufacturer of that refractometer?
It's a polish manufacturer called PZO. This model is RL2, but they don't have any information about it on their page. The oldest manual they have is about the RL3, which seems to be quite similar, but they're selling the RL4 today.
Thanks a lot!
You're welcome :)
Good
YOU SHOULD HAVE USED PLASTIC DROPPER TO PROTECT PRISMS FROM SCRATCHING
WHY IS IT IMPORTANT TO GET "X" IN BETWEEN LIGHT AND DARK ?
HOW DO YOU GET RI OF GEMS ?
The prisms are generally made of fused silica or quartz, and both of those are harder than glass, so it's unlikely that you will scratch the prism with a Pasteur pipette, as they are made from very soft glass. He answers your first question at about 1:10. For gems you use a different instrument, often a laser refractometer. Source: I am a glass chemist.
Thanksss
What is alpha t?
Alpha t is the critical angle of total reflection. When the angle of the light hitting the surface of the refracting prism gets to alpha t and above it, the light is reflected completely. If it's below alpha t the light is transmitted through the surface.
How can light be reflected back to liquid from a refracting prism because a refracting prism is denser than a sample liquid....
And total internal reflection only takes place when there is a rarer medium in front ...
Please 🙏 Ans
Thanks a lot! My lab manual is piece of garbage.
Thank you for this upload. It helped a lot.