WVIT 365 Final Exam Questions and
Correct Answers
What is tartrate instability? - Answer-when tartrates precipitate at any time during or after
fermentation as potassium bitartrate or calcium tartrate
What does tartrate instability crystallization/precipitation depend on? - Answer-concentrations of
components, presence of nucleating material, presence or absence of complexing factors
What are the methods for dealing with tartrate instability? - Answer-removing components by chill
proofing or seeding chilled wine, preventing crystallization by mannoproteins or gum arabic, ion
exchange, ignoring the issue
What is concentration product (CP)? - Answer-method to assess stability that measures the
concentration of K, tartrate ions, pH, and alcohol and an equation and table to analyze results
What is the equation to find concentration product (CP)? - Answer-[K+ mol/L][total tartrate mol/L]
(%HT-)
What is protein stability? - Answer-causes the precipitation of soluble solids that creates haze or
deposits
Correct Answers
What is tartrate instability? - Answer-when tartrates precipitate at any time during or after
fermentation as potassium bitartrate or calcium tartrate
What does tartrate instability crystallization/precipitation depend on? - Answer-concentrations of
components, presence of nucleating material, presence or absence of complexing factors
What are the methods for dealing with tartrate instability? - Answer-removing components by chill
proofing or seeding chilled wine, preventing crystallization by mannoproteins or gum arabic, ion
exchange, ignoring the issue
What is concentration product (CP)? - Answer-method to assess stability that measures the
concentration of K, tartrate ions, pH, and alcohol and an equation and table to analyze results
What is the equation to find concentration product (CP)? - Answer-[K+ mol/L][total tartrate mol/L]
(%HT-)
What is protein stability? - Answer-causes the precipitation of soluble solids that creates haze or
deposits
