# 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.

Now the question arises is, How much amount of KOH is required to prepare 0.1 Molar KOH solution in 100 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