solution please :)

[ladyy]

Citric acid, C6H8O7, is an acid found in the juice of many fruit. The following analysis was carried out to
determine the concentration of citric acid in a sample of lemon juice.
A 25.00 mL sample of the lemon juice was diluted to 100.0 mL in a volumetric ß ask. A 20.00 mL aliquot of
this diluted solution was added to a 100 mL conical ß ask with two drops of indicator. A burette was Þ lled with
a solution of 0.142 M sodium hydroxide, NaOH, and the titration produced an average titre of 11.88 mL.
The equation for the reaction is

C6H8O7(aq) + 3NaOH(aq)+ Na3C6H5O7(aq) + 3H2O(l)
a. Calculate the concentration, in mol L-1, of C6H8O7 in the undiluted lemon juice.

[Edmund]

[akira88]

Omg that's the exact same question I had on my SAC... where did you get that question from?

[ladyy]

its one of the VCAA sample prac exams