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

"Dick Heckman" > wrote in message
...
> 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

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:
> 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
>
> "Dick Heckman" > wrote in message
> ...
>> 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
>

On Jul 28, 8:35*am, Dick Heckman > wrote:
> 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:
> > 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
>
> > "Dick Heckman" > wrote in message
> ...
> >> 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

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

On Jul 27, 10:09*pm, Dick Heckman > wrote:
> 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

Bob,

Not every winemaker can go by taste, intuition or experience
like you may. So for those of us who can't measuring is they way to go.

luc

wrote:

> 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
>
> On Jul 27, 10:09Â*pm, Dick Heckman > wrote:
>> I'm confused. Â*I've read 3 test procedures and gotten 3 ways to do the
>> test. Â*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. Â*Help!
>>
>> Dick

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