This point got lost in the discussion.
Making your own NaOH solution without standardizing it with KHP is an exercise in futility --- you will not get an accurate result because you cannot measure a known quantity of NaOH.
Potassium hydrogen phthalate (KHP) is not hygroscopic or volatile, so the amount can be accurately measured (unlike other acids being suggested above). If you can acquire some, I'll help you create a proper NaOH solution. Otherwise I wouldn't bother with testing TA using a bad NaOH solution.
This makes zero sense; one or both of your solutions are way off the mark.
There's a way to titrate your NaOH with citric acid IIRC, which is supposed to be easier to make accurate solutions of. It's described in detail in Dunn's Scientific Soapmaking.
https://www.amazon.com/Scientific-Soapmaking-Chemistry-Cold-Process/dp/1935652095
There's a way to titrate your NaOH with citric acid IIRC, which is supposed to be easier to make accurate solutions of. It's described in detail in Dunn's Scientific Soapmaking.
https://www.amazon.com/Scientific-Soapmaking-Chemistry-Cold-Process/dp/1935652095
http://www.cider.org.uk/acid_titration.html
Detailed explanation of titration of malic acid, explaning the various points of the titration curve.:
https://socratic.org/questions/calc...0-2m-maleic-acid-with-0-2m-sodium-hydroxide-c
You will need to plot an entire titration curve. You need to work out how many moles of NaOH you have added going from the middle of the first steep leg to the middle of the 2nd steep leg of your curve. That is wil give you the molarity of your juice.
Without a curve, how would you know you have neutralized all the H+?i think just diluting the lye down a lot, then dividing how many mols of lye it took...then multiplying that by the mol weight of malic acid, and then dividing by 2 is the best way....
lye is 40, malic is 134, and it takes 2 mols of lye to neutrilize 1 mol of malic...
Without a curve, how would you know you have neutralized all the H+?
That will only tell you you have reached a certain pH. It does not tell you how many moles of malic acid you have in your juice.phenolphthalein will turn pink?
That will only tell you you have reached a certain pH. It does not tell you how many moles of malic acid you have in your juice.
Yep, after reading all this. Definately made my head hurt.
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