1. Simplest and most informative way to characterize a carboxylic acid is to determine its neutralization equivalent. The number of carboxyl group in the molecule of the following compound is 1. 0.21 gram of an unknown carboxylic acid solid is dissolved completely in ethanol and titrated with 0.1 N NaOH. At the endpoint 18.5 mL NaOH is used.
What is the molecular weight of the unknown?
2) Fisher Esterification of benzoic acid 13.0g Benzoic Acid (MW=122g/mol) and 30 mL of methanol (Density = 0.79g/cm^-3; MW = 32g/mol) was used for synthesis. 6.0g of methyl benzoate (MW 136g/mol) is obtained. SHOW YOUR WORK! A) Limiting reagent of this reaction? B) % Yielfod methyl benzoate?
3) consider the titration of 25.00ml of 0.650 M propanoic acid, HC3H5O2 ( Ka = 1.3 X 10^-5), with 0.750 M sodium hydroxide, NaOH, and answer the following questions?
A.what is the equivalence volume, ve, of the titration in ml?
B. What is the itital pH of the HC3H5O2 solution?
C. what is the pH at the equivalence point?
D. what is the pH at the half equivalence point, ve/2?
E. What is the pH after 9.00 ml of NaOh has been added?
F. what is the pH after 26.00ml of NaOH has beeb added?