Malic acid (C4H605) is one of the alpha hydrox acids which is naturally found in apples.the reaction of hydrochloric acid with sodium maleate to form malic acid and sodium chloride is according to the following equation:

HCl+C4H505Na-------> C4H6O5 + NaCl

You have been asked to to prepare as maleate buffer (Ka=3.908×10^-4) using sodium maleate (M.W=178.05g/mol) and 7.29×10^7 ppm of HCl. How many millilitres of HCl should you add to 250.00ml of 13.4×10^5ppm sodium maleate to produce a buffer with a pH of 3.37?