Chard PH/Acid Adjustment

PH of chard read 3.85 at crush. We want more like 3.5. Added 12oz of Tartaric Acid to lower the PH. Expect it will be around 3.6. (PH meter went on the fritz so we can't be sure).

Tartaric Acid group calculations went something like this:

Initial goal was to drop PH by .2 (later decided by .3). Did trial run with a 10% soln and added 2ml of acid to 100ml of juice. Checked with the PH meter. It read about .2 lower. Success!

Scale-up to larger amount of juice (36G).

2grams/liter to drop by .2PH
Est 270 liters of juice
Cross reference said that 5grams of Tartaric Acid was 1 tsp.
(http://winemaking.jackkeller.net/measures.asp)
For 270 liters we need 54 tsp or 18 tbsp of Tartaric Acid
1 oz is 2tbsp so 9oz of Tartaric Acid needed. (4.5oz/.1PH drop)
Later determined that PH meter was reading "low", so we increased to 12oz. (Actually would have used 13.5oz, but only had 12oz and store was out. Good enough!)

Grains, grams, gallons, liters, tablespons....OK. Run that by me again?! ;)