How do you find the acidity level of a fruit?

1. Squeeze each of the fruits and obtain the juices.
2. Filter all of the juices through the funnel with chux towel into different beakers.
3. Dilute all fruit juices in a volumetric flask, by factor of ten, make standard solutions of all.(0.1m)
4. Using 0.1m hydrochloric acid and sodium hydroxide perform around three to four titrations to accurately determine the concentration of the sodium hydroxide.
5. Using the same sodium hydroxide, titrate against all of the diluted fruit juices with about five drops of phenolphthalein.

i hope this helps its what i used and got an a+ on it :)