Acid Base Chemistry Lab Report

General Chemistry i Laboratory Report

Name: Ivan Chan Lab day: Friday

Date of experiment: iv/12/19 TA: Fang

9. Acids and Bases - 2

Purposes of the experiment and cursory overview of experimental method(southward)

The purpose of this lab was to further explore the basic concepts of acids and bases through 2

titrations. In Part A, a weak triprotic acid, histidine, was titrated with NaOH, a potent base of operations.

Phenolphthalein and bromocresol greenish were used equally indicators to decide the endpoints of the

titration. The titration bend was plotted, and the iii equivalence so the half-equivalence

points were calculated using the idea of maximum outset derivative (rate of pH increase). The

corresponding pH's were observed to determine the One thousanda values for each protonated form of

histidine. The Henderson-Hasselbach equation at the half-equivalence point, pH=pKa, was used

for this purpose. In Function B, the weak base ammonia was titrated with the strong acrid HCl. The

indicator thymolphthalein was used to decide the endpoint of this titration. Only i

equivalence point was observed, since ammonia is a monoprotic weak base. The Ka value of

ammonium was adamant using the half equivalence point of this titration using pH=pKa at the

half equivalence point method. However, the since this was a weak base titration, the Kb value

for ammonia likewise calculated using Chiliadw = Ka 10 Mb. The pH of both titrations was monitored using a

pH electrode that was calibrated using a buffer with pH=7 and one with pH=5.

Results & calculations

Acid Base Chemistry Lab Report,

Source: https://www.studocu.com/en-us/document/de-anza-college/general-chemistry/lab-report-ex-9-acids-and-bases-ii/8020549