Chemistry Homework Solutions
Problem
#37022

Calculation of Amounts of Constituents in Acid / Base Equlibrium

I am a winemaker and in the course of my work I simply do not understand how to do a calculation of this sort. We usually express acidity (in wine) in terms of titratable acidity in grams tartaric acid per liter.  Here is the information that I have:

If 500 mg/L of lactic acid is added to distilled water and NaOH is added until the pH
= 3.1, what are the final amounts of each species in the acid equibrium ? What would it be expressed as titratable acidity in grams/L of tartaric acid?  I know that the formula for Lactic acid is C3H6O3 and the pKa = 3.86.  The formula for tartaric acid is C4H606.

Any guidance or direction on how to perform this calculation this would be most appreciated.

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