Featured in PASCO’s College Chemistry Instructor Guide
College Instructor edition with 36 experiments covering introductory and general chemistry topics.
Ka Values of Acids
Use a pH sensor and drop counter to determine the acidity constants of two isomeric multi-protic acids and relate the acidity constants to their structural differences.
Students determine the acidity constants of two isomeric multi-protic acids, use these values to identify the acids, and provide an explanation for the difference in values based on molecular force considerations.
Students will gain experience conducting the following procedures:
- Determining the pKa of the multiple equivalence points of two isomeric multi-protic acids (fumaric acid and maleic acid) through titration.
- Using a pH sensor and drop counter to perform titration measurements and determine equivalence points and solution concentrations.
Sensors / Equipment Used:
Allows students to measure Temperature, pH/ISE/ORP, Absolute Pressure & Voltage in one sensor. For use with PASPORT Interfaces.
Is a professional drop counter that allows students to capture detailed titration data. For use with PASPORT Interfaces.
Micro stir bar
Beaker, 250-mL - 2
Beaker, 25-mL - 2
Buret , 50-mL
Graduated cylinder, 100-mL
Unidentified fumaric acid solution - 50 mL
Unidentified maleic acid solution - 50 mL
0.500 M Sodium hydroxide (NaOH) - 150 mL
Buffers, pH 4 and pH 10 - 10 mL
Wash bottle with deionized water
Cotton swab or tissue
The Associated Bundle:
Contains the probeware for completing experiments in the College Chemistry lab manual.