first TA test

I tried my very first TA test. I used a 15ml sample of the wine and my PH meter and the color solution. Well it took 14.5ml of sodium hydroxide - NaOH 0.10 to raise the PH to 8.2

So is my acid 1.45% TA? Is this possible? Is the alcohol throwing me off? Is the acid test only for must?

This is finished kit pinot grigio that is going into the freezer for CS.

The video is the beginning and the end of the test ... I had to shorten it to less then 10 min.

[ame]http://www.youtube.com/watch?v=QPpm65xE-IY[/ame]

You used 3X the normal required amount of 5ml wine. So if you divide your NaOH used by 3 you get 4.83ml X 1.5 = 7.25 g/L or .725% which is right in the ballpark range of 7-9 g/L for a dry white wine.

ibglowin said:

You used 3X the normal required amount of 5ml wine. So if you divide your NaOH used by 3 you get 4.83ml X 1.5 = 7.25 g/L or .725% which is right in the ballpark range of 7-9 g/L for a dry white wine.

Click to expand...

Thanks, I got the data from here.

I was hoping it wasn't that high.

ibglowin said:

You used 3X the normal required amount of 5ml wine. So if you divide your NaOH used by 3 you get 4.83ml X 1.5 = 7.25 g/L or .725% which is right in the ballpark range of 7-9 g/L for a dry white wine.

Click to expand...

So it is:

5ml of wine
amount of NaOH x 1.5 = .000% TA -or- 0.00 g/L

is this correct?

Yes, as long as your using 0.1N NaOH

ibglowin said:

Yes, as long as your using 0.1N NaOH

Click to expand...

Thanks ... I'm going to retest. I want to see if it changes after 2 weeks of CS.

ibglowin said:

Yes, as long as your using 0.1N NaOH

Click to expand...

Am I reading more wine correctly that you can add distilled water to increase your sample size? and it don't matter how much? HERE Step 2

Yes thats correct. I don't add water, I just tilt the vial to get the probe under neath the sample until I get enough NaOH into the sample so that you don't need to tilt it anymore. I can tilt the vial, add NaOH, swirl, read the pH meter, rub my belly, pat my head all at the same time I think!

Ok, I retested the same wine and feel like I nailed the test. I was very careful to get a 5ml sample size. I did see a slight color change right at the 8.2PH mark. It took 4.6ml of 0.10 NaHO to reach a PH of 8.2.

4.6 X 1.5 = 6.9 g/L -or- .69% TA

In the first video I am just under the required 8.2 and in the second video I added one more drop which took is over 8.2

[ame]http://youtu.be/nPgGlS2uQXI[/ame]

[ame]http://youtu.be/x9xIIyDyWMk[/ame]

Thanks a bunch Mike ...

Glad to help and glad the numbers are pretty close to each other!