Astudent weighs a sample of potassium hydrogen phthalate (khp) to prepare a primary standard for a titration. she later discovers that the khp was contaminated with sugar. to determine the amount of khp in the mixture, she takes 5.368 g5.368 g of the mixture and make a 100.0 ml100.0 ml solution. the student then titrates 10.00 ml10.00 ml of this solution with a 0.1224 m0.1224 m sodium hydroxide solution. she finds that 16.74 ml16.74 ml of the naoh naoh solution is needed to reach the end point. what is the percent by mass of khp in the mixture