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NEMO-Chemistry
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[*] posted on 5-1-2018 at 02:19
Old Filter paper


The site killed my long post! the pics were too many! So I will split it into parts. (seriously 8mb limit!!) in 2018!


Anyway watched a bunch of old filter paper on ebay for weeks, there was also some chromatography paper. The pictures made the paper look old and crap, no one brought it and the price seemed high.

So after a few weeks i contact the guy, i offer a super low price and he accepts it! The stuff turned up today.

pleasant surprise, there are a few stains on the wrappers, but the paper itself is in perfect condition, not only that but some the boxes still have the original seal!

Some of them are hand made and all are in excellent condition, no idea of the age, but to me they look pretty old!

Anyone got a guess at the decade?

I will post the pics in several batches because of the size limit.


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[*] posted on 5-1-2018 at 02:26


the opened ones i will use and keep the sealed ones for my museum of old shit :P

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[*] posted on 5-1-2018 at 02:30


some more

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[*] posted on 5-1-2018 at 02:31


This page may interest you http://www.vintagepaper.co.uk/j-green--sons-hayle-mill-barch...



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[*] posted on 5-1-2018 at 02:31


I love the fact some still have the proper seals, it surprised me the paper itself is still in perfect condition.


[Edited on 5-1-2018 by NEMO-Chemistry]

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[*] posted on 5-1-2018 at 02:36


sorry so many posts but the size limit is a pain!


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[*] posted on 5-1-2018 at 02:39


The chromatography paper will be handy! I have alot of TLC plates, but sometimes a quick TLC on paper saves using the more expensive glass plates


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[*] posted on 5-1-2018 at 02:42


There is loads of it! I will use some later for the coffee extraction.


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[*] posted on 5-1-2018 at 02:45


Some has a really nice feel to it.


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[*] posted on 5-1-2018 at 02:47


The glass fibre paper picture didnt come out well, these are nice small circles that seem very thick and fine in particle size.


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[*] posted on 5-1-2018 at 05:55


Quote: Originally posted by NEMO-Chemistry  
There is loads of it! I will use some later for the coffee extraction.


There's an irony: using lab paper as a coffee filter.




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[*] posted on 5-1-2018 at 06:49


Quote: Originally posted by j_sum1  
Quote: Originally posted by NEMO-Chemistry  
There is loads of it! I will use some later for the coffee extraction.


There's an irony: using lab paper as a coffee filter.

That didnt occur to me :D, some of these are much finer than coffee papers and they were cheaper.

I got new 250ml sintered funnel hat was silly cheap, but the pore size is a bit big. So i might use some paper on top of it.

Most the boxes are still factory sealed which also appealed.
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[*] posted on 5-1-2018 at 11:14


Nice find !

Try reducing the photos to 400x400 or something like that. It reduces the size drastically, and tends to make them display the right way up.

I'm on Ubuntu and use ImageMagik to reduce the size.




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[*] posted on 5-1-2018 at 14:10


Quote: Originally posted by aga  
Nice find !

Try reducing the photos to 400x400 or something like that. It reduces the size drastically, and tends to make them display the right way up.

I'm on Ubuntu and use ImageMagik to reduce the size.


Thx aga, i wondered why i couldnt get them the right way around!!

I tried using the phone both ways!! Ok here we go.....

First filtration of 3 weeks old coffee! then add a base to some, and acid to the other. re filter and see what drop outs!

Obviously TLC's as well if I can work out the solvents to use.
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[*] posted on 5-1-2018 at 14:24


Once you get some extract, try adjusting the pH CAREFULLY (it is very very easy to overshoot) then give the solution some time.

Some stuff will fall out at a different pH to others.

Edit:

In Practical terms (based on the maths et al that blogfast25 taught me) that means having x10 different acid/base concentrations to decrease/increase the pH with.

As you see a change in pH, swap to a x10 weaker solution to add for the next adjustment.

E.g. if you're Increasing pH with some NaOH solution, make up a 1[M] solution, and 0.1[M] and a 0.01[M] even a 0.001[M] if you really want to hit the spot.

In an amateur setting, just make the 1[M] solution, take 10ml of that and stick it in 90ml of water to get 0.1[M], then repeat to make the rest.

[Edited on 5-1-2018 by aga]




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[*] posted on 5-1-2018 at 15:04


Quote: Originally posted by aga  
Once you get some extract, try adjusting the pH CAREFULLY (it is very very easy to overshoot) then give the solution some time.

Some stuff will fall out at a different pH to others.ducing pH, mak

Edit:

In Practical terms (based on the maths et al that blogfast25 taught me) that means having x10 different acid/base concentrations to decrease/increase the pH with.

As you see a change in pH, swap to a x10 weaker solution to add for the next adjustment.

E.g. if you're Increasing pH with some NaOH solution, make up a 1[M] solution, and 0.1[M] and a 0.01[M] even a 0.001[M] if you really want to hit the spot.

In an amateur setting, just make the 1[M] solution, take 10ml of that and stick it in 90ml of water to get 0.1[M], then repeat to make the rest.

[Edited on 5-1-2018 by aga]

Thanks that helps alot. I have a couple volumetric flasks. I have the incubator turned on to warm everything upto 20C.

Dont laugh but the lab is hovering just under 1C at the moment!! I wish i had heating in it! Time to think about putting a new radiator in the room.

I was going to use Sodium Carbonate, Caffeine apparently gets destroyed above PH 9, i will test that however.

HCL should do for the acid, i need some stock solution of that anyway.
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[*] posted on 5-1-2018 at 15:09


Sadly i must leave Paradise for 1 day and 1 night, starting tomorrow.

Going from +26 C to -4 C even for 48 hours is a serious trial.

Sometimes i really do feel sorry for the reagents.




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[*] posted on 5-1-2018 at 17:26


I dont get my PH meter for a few days yet. What acid would be best to use as a standard? I would like to titrate the coffee at certain points. I have small amounts of Sulfanilic acid and Sulfamic acid, as well as the Sulphuric acid, Nitric acid and Hydrochloric acid.

At some point I need to make some calibration solutions up for the PH probe, this is a decent one that i hope to be here by mid next week.
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[*] posted on 5-1-2018 at 17:43


IIRC, buffer solutions are the way to go for calibration. On Amazon and Ebay they sell little packets of powders that, when dissolved in a fixed amount of water, form a solution of the desired pH. I believe they used a phosphate buffer for the 6.86 buffer solution, but I forgot the composition. The 4.00 buffer solution used hydrogen phthalate salts along with phthalic acid to make the desired solution. Let me see if I can find that bookmarked resource I have.

EDIT: Aha, found it! 0.477 mol of sodium dihydrogen phosphate and 0.523 mol of sodium hydrogen phosphate in 900 mL and top off to 1 L. You can scale it down of course (this 6.86 pH). That is, if you can get the salts :(.

[Edited on 1-6-2018 by ninhydric1]




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[*] posted on 5-1-2018 at 20:05


Quote: Originally posted by ninhydric1  
IIRC, buffer solutions are the way to go for calibration. On Amazon and Ebay they sell little packets of powders that, when dissolved in a fixed amount of water, form a solution of the desired pH. I believe they used a phosphate buffer for the 6.86 buffer solution, but I forgot the composition. The 4.00 buffer solution used hydrogen phthalate salts along with phthalic acid to make the desired solution. Let me see if I can find that bookmarked resource I have.

EDIT: Aha, found it! 0.477 mol of sodium dihydrogen phosphate and 0.523 mol of sodium hydrogen phosphate in 900 mL and top off to 1 L. You can scale it down of course (this 6.86 pH). That is, if you can get the salts :(.

[Edited on 1-6-2018 by ninhydric1]


I might buy the packets then :D
Thx for that. just tried filtering the coffee! No idea what pore size the filter is but its really coarse!!

So looks like i am cutting filter paper out to fit the funnel lol.
I am off to bed, i hope to get the website online soon, then you can all see what i am upto with the coffee :D.
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[*] posted on 5-1-2018 at 20:06


is this the stuff?

http://www.ebay.co.uk/itm/Sodium-dihydrogen-phosphate-dihydr...

Correction this is one of them
http://www.ebay.co.uk/itm/Sodium-di-Hydrogen-Phosphate-Anhyd...

although i have issues with that company

[Edited on 6-1-2018 by NEMO-Chemistry]
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[*] posted on 5-1-2018 at 23:38


You can get the packets on Amazon. For $10 you get buffer solution packets for pH 4.00, 6.86, and 9.18.
Link: https://www.amazon.com/15-pack-Buffer-Solution-Accurate-Cali...

Unless you have an extremely accurate analytical balance, making extremely accurate buffer solutions are difficult. You could try ;), but you would also need a source of sodium hydrogen phosphate, also known as disodium hydrogen phosphate.




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[*] posted on 6-1-2018 at 06:59


I have just purchased a good balance, its in a thread somewhere...

https://www.ebay.co.uk/itm/Sartorius-Analytical-Balance-BL12...

Thats the one i won. I dont use it all the time, i save it for when i need accurate weights. my drug dealer type scales do for most things

The problem is some the names are slightly different, but i will look later and see if I can get the chemicals myself. I have a need for taking alot of PH readings, packets would get expensive quickly.

The PH meter is a decent Jenway one, with a temp compensation probe etc, it was kindly donated by someone who is helping with some stuff I am doing.

[Edited on 6-1-2018 by NEMO-Chemistry]
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[*] posted on 6-1-2018 at 08:11


Quote: Originally posted by ninhydric1  
You can get the packets on Amazon. For $10 you get buffer solution packets for pH 4.00, 6.86, and 9.18.
Link: https://www.amazon.com/15-pack-Buffer-Solution-Accurate-Cali...

Unless you have an extremely accurate analytical balance, making extremely accurate buffer solutions are difficult. You could try ;), but you would also need a source of sodium hydrogen phosphate, also known as disodium hydrogen phosphate.

I calibrate my pH meter with a saturated solution of borax (9.32) and a saturated solution of cream of tartar (3.56) .
Why would I need a balance?
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[*] posted on 6-1-2018 at 12:48


Quote: Originally posted by unionised  
Quote: Originally posted by ninhydric1  
You can get the packets on Amazon. For $10 you get buffer solution packets for pH 4.00, 6.86, and 9.18.
Link: https://www.amazon.com/15-pack-Buffer-Solution-Accurate-Cali...

Unless you have an extremely accurate analytical balance, making extremely accurate buffer solutions are difficult. You could try ;), but you would also need a source of sodium hydrogen phosphate, also known as disodium hydrogen phosphate.

I calibrate my pH meter with a saturated solution of borax (9.32) and a saturated solution of cream of tartar (3.56) .
Why would I need a balance?


Thats handy to know! Cheap and simple, thank you unionised
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