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ÀWỌN OHUN WÍWỌ̀
Nylon Salt: Hexamethylenediamine and Adipic Acid Crystallized from Alcohol, Carothers 1938
Equal moles of hexamethylenediamine and adipic acid, warmed in watery alcohol until they dissolve, crystallize on cooling as white nylon salt (Carothers, du Pont, US 2,130,947, 1938). The salt always holds the two exactly one to one, which is what makes the nylon come out right.
The picture: our drawing of the warm flask, the crystals and the filter.
Àárín
A day
Ìlànà
1
1
Weigh one mole each
Weigh one mole each
Weigh 144 g hexamethylenediamine and 174 g adipic acid: one mole of each.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Hexamethylenediamine144 g
Acid adipic174 gÀwọn irinṣẹ́ tí a nílò:
Òṣùwọ̀n Díjítà Ilé Ìdáná2
2
Warm to dissolve
Warm to dissolve
Put both in a flask with 1300 g of 95 % alcohol and 210 g water. Warm until everything dissolves. Keep flames away from the alcohol.
Àwọn irinṣẹ́ tí a nílò:
Ìgò Erlenmeyer
Pátákó Gbígbóná
Ethanol - ìpele ilé-ìwádìí, 95 %
Omi Àyọ́3
3
Cool and filter
Cool and filter
Cool the solution. The salt separates as white crystals. Filter them off.
Àwọn irinṣẹ́ tí a nílò:
Funnel Büchner (porcelain)
Ẹ̀rọ ìfàfẹ́fẹ́jáde4
4
Recrystallize
Recrystallize
Dissolve the crystals warm in 1300 g of 95 % alcohol and 200 g water, cool and filter again. Carothers got 247 g, melting at 183–184 °C.
Àwọn irinṣẹ́ tí a nílò:
Ìgò ErlenmeyerPátákó GbígbónáEthanol - ìpele ilé-ìwádìí, 95 %Omi Àyọ́Funnel Büchner (porcelain)Ẹ̀rọ ìfàfẹ́fẹ́jáde5
5
Check the balance
Check the balance
For an exact one-to-one salt, the pH of its solution sits at the turning point of the titration curve, about 7.6 for this pair.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ ìwọ̀n pH àti ohun èlò títọ́6
6
Moles
Moles
Ń ṣí ìwé Jupyter…
Àwọn ohun-èlò
2- 144 gÀyè
- 174 gÀyè
Ìtọ́nisọ́nà yìí ń ṣe
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