A student 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 5.544g of the mixture and make a 100.0 mL solution. The student then titrates a 10.00mL aliquot of this solution with a 8.1480M sodium hydroxide solution. She finds that 13.84mL of the NaOH solution is needed to reach the end point. What is the percent by mass of KHP in the mixture? Hint: Make sure to correct for the fact that you only used part of the original sample