A 0.239 g sample of unknown organic base is dissolved in water and titrated witha 0.135 M HCl solution. After the addition of 18.35 mL of acid, a pH of 10.73 is recorded. The equivalence point is reached when a total of 39.24 mL of HCl is added. The base and acid combine in a 1:1 ratio.(a) What is the molar mass of the organic base?(b) What is the K_bvalue for the base? The K_bvalue could have been determined very easily if a pH measurement had been made after the addition of 19.62 mL of HCl. Why?

A 0.239 g sample of unknown organic base is dissolved in water and tit

1.	A 0.239 g sample of unknown organic base is dissolved in water and titrated witha 0.135 M HCl solution. After the addition of 18.35 mL of acid, a pH of 10.73 is recorded. The equivalence point is reached when a total of 39.24 mL of HCl is added. The base and acid combine in a 1:1 ratio.(a) What is the molar mass of the organic base?(b) What is the K_bvalue for the base? The K_bvalue could have been determined very easily if a pH measurement had been made after the addition of 19.62 mL of HCl. Why?
Answer» SOLUTION :`(a) 45.12 (B) 4.72 XX 10^(-4)`