How does the titration curve of the buffered lemonade compare to the curve of the unbuffered citric acid solution?

THE BUFFER IN LEMONADE 

1. Determine which solution, buffered or unbuffered reacted with more moles of NaOH when the equivalence point was reached?
2. Observe the graph of each titration. How does the titration curve of the buffered lemonade compare to the curve of the unbuffered citric acid solution?
3. What is the formula of citric acid and the sodium salt of citric acid?