0.1 M KOH Solution Preparation and Standardization

Preparation and Standardization of 0.1 M KOH Solution by using HCL and phenolphthalein as an indicator in Pharmaceutical Labs.

Aim: To Prepare and measure 0.1 M KOH solution with HCl.

Materials and Reagents Requirements:

Glass: A burette, burette stand, conical flask, volumetric pipette, beaker, volumetric flask, funnel, glass rod, and a wash bottle.
Chemicals: Potassium hydroxide (KOH), hydrochloric acid (HCl), and phenolphthalein indicator.

Preparing 0.1 M KOH Solution:

• Take 5.6 grams of KOH and put it in 500 ml of pure water.
• Once it dissolves completely, add more water to make it 1000 ml.

Let’s Understand it by using the formula:

Molarity=n/v

Whereas, n= no. of moles
v= Volume of solution in a liter, 1 Liter is equal to 1000 ml.

Standardization of 0.1 M KOH Solution

• Clean and dry all glass tools properly.
• Rinse the burette with water, then rinse it with some titrant solution.
• Put the titrant solution in the burette from a clean, dry beaker using a funnel.
• Remove any air bubbles and set the reading to zero.
• Pour 20.0 ml of the solution and add 0.1 M HCl with 0.5 ml of phenolphthalein as an indicator.
• When it turns violet to blue, that’s the endpoint.
• Repeat this process three times for accuracy.
• Record the burette readings, calculate the average, and find the KOH solution’s strength.
• 1 ml of 0.1 M HCl equals 0.005611 g of KOH.

Reference: Indian Pharmacopeia