I'm confused. I've read 3 test procedures and gotten 3 ways to do the test. Lum says to multiply the ml of naoh by 1.5. Jeff Cox says divide by 2 and somebody posted a procedure here from the Wine Thief which I copied some time ago which says the the amount used is the TA in ml/1000. Help!
Dick
Dick, There are two variables. The size of the wine sample and the "normality" of the sodium hydroxide. If a 5 ml wine sample and if the normality of the sodium hydroxide is 0.1, then the TA equals the amount of sodium hydroxide in milliliters used in the titration multiplied by 0.15. Lum
You can tell I'm not a chemist. The Wine Thief article was using a test kit and there wasn't any info on the chemicals used, just how much NAOH had been used so I felt that this was probably why it was different. Both you and Jeff Cox specify the .1N NAOH but he used a 15ml sample. Because it was said that dilution of the material if red wine was OK to do to make it easier to read, I didn't pick up on the sample size difference.
Sorry I quoted your multiple wrong. I realized that I'd put the . in the wrong place as I hit send. Thanks for the help.
Dick
Lum Eisenman wrote:
Best to use this universal equation: TA in grams/ liter = 75 x Molarity of NaOH x Volume of NaOH used/ volume of Juice Sample For % merely divide answer by 10
My question is, why would you even need to know the TA?? I haven't done a TA in 8 years and my wines seem to turn out fine.
Bob
Have something to add? Share your thoughts — no account required.
Ask the community — no account required