Hi,
This is a fairly easy one-step tek suited for those who cannot find / afford to buy NaOH/lye, KOH or any other decent base. This tek relies on the manufacturing of sodium carbonate (which is not easy to find where I am coming from - same goes for NaOH, which is totally unheard of) from sodium bicarbonate
The idea is not new - it comes from another thread (http://www.dmt-nexus.me/forum/Default.aspx?g=posts&t=1404) and has already been tried by 69ron who wrote:
Quote:Yeah...SWIM made sodium carbonate from sodium bicarbonate before just by baking it in an oven. It is very easy to do but causes CO2 gas to form which causes the sodium bicarbonate to jump around in the pan. Make sure you cover the pan with tin foil or your whole oven will be covered in pieces of sodium carbonate.
Sodium bicarbonate powder (aka bicarbonate of soda, baking soda) can be easily found in supermarkets and bakeries. It is a raising agent added in doughs. DO NOT buy baking powder which is a mixture of sodium bicarbonate and tartaric acid.
The aim is to convert sodium bicarbonate which is a very weak base, (pH ~8 ) to sodium carbonate which is a moderately strong base that will easily give you a pH of >12. The reaction is:
2NaHCO3 ----> Na2CO3 + H2O + CO2
sodiun bicarb ----> sodium carb. + water + carbon dioxide
And you just need
heat to do it. So,
1) Heat up the oven at 200 Celsius
2) put as much sodium bicarbonate as you want in your oven
3) cook it for 1 hour.
That's it, now you have sodium carbonate.
You can now dissolve 12.5 grams of it / litre water for a pH of ~12
.......or 25.0 grams of it / litre water for a pH of ~12.3
.......or 37.5 grams of it / litre water for a pH of ~12.4
.......or 50 grams of it / litre water for a pH of ~12.45
.......or 100 grams of it / litre water for a pH of ~12.5
.......or 200 grams of it / litre water for a pH of ~12.7
Note that upon baking sodium bicarbonate its weight will decrease; In fact, taking the stoichiometry of the reaction and the molecular weights of NaHCO3 and Na2CO3, your final product will be ~37% lighter. This is exactly what you will find, so if you cook 200g of sodium bicarbonate you will get ~ 125g of sodium carbonate.
Enjoy!
[
EDIT: EXTREME CARE should be taken when adding sodium carbonate in an acidic solution. Sodium carbonate neutralises acids and this process also liberates carbon dioxide which causes the solution to foam. Just mix some vinegar or lemon juice with sodium carbonate and see.
If one wishes to basify an acidic extract, then sodium carbonate needs to be added slowly, waiting for the foaming to settle, then add a bit more.
When addition of sodium carbonate does not cause any foaming this is an indication that the solution is neutral and pH is around 7. From this point onwards one can add as much sodium carbonate as one desires for basification without fearing that foaming will happen.
Many thanks to SyZyGyPSy for bringing this issue up. ]
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