Project Objectives
Standardization of NaOH (titrant) & HCl stock solutions
Preparation of 2.7 mM chlorauric acid solution
Preparation of buffer solutions
Today's Tasks
Standardization of NaOH titrant solution (trial 1)
- Using "0.2 M NaOH" stock solution as a titrant
- Using Orion 5-Star meter with pH electrode
- Meter calibrated with homemade 1:1 HAc/NaAc and 1:1 Borate buffers
- Potassium Hydrogen Phthalate (KHPth) is a primary standard for acid/base solutions
Analyzed Data
Dried 10 g KHPth overnight at 110 °C
Placed 1.04 g KHPth in 250 mL Erlenmeyer flask & added 50 mL water (grad cyl)
After dissolution, added 3 drops phenolphthalein
Added base in 0.2 - 5 mL increments, measuring pH at each step
Data file available in DropBox
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