Preparation of 0.5% bleaching solution from 35% bleaching powder

To prepare a 0.5% bleaching solution from 35% bleaching powder, follow these steps:

Materials and Equipment:

1. 35% bleaching powder (calcium hypochlorite)

2. A clean container or bucket

3. Measuring scale or scoop

4. Water

5. Safety goggles

6. Gloves

7. Stirring rod

Procedure:

1. Put on safety goggles and gloves to protect your eyes and skin, as bleaching powder can be corrosive and harmful if it comes in contact with them.

2. Determine the volume of the 0.5% bleaching solution you want to prepare. For example, if you want to make 1 liter of the solution, calculate 0.5% of 1 liter, which is 5 milliliters (ml) of bleaching powder.

3. Measure out the required amount of 35% bleaching powder. In this case, you would measure 5 grams (g) of 35% bleaching powder using a measuring scale or scoop. Ensure that you are accurate in your measurements.

4. Pour the measured bleaching powder into the clean container or bucket.

5. Add water to the container to make up the desired volume of the solution. In this example, add water to the 1-liter mark if you want to make 1 liter of the 0.5% bleaching solution. Be cautious and add water slowly to avoid splashing.

6. Stir the mixture thoroughly using a stirring rod until the bleaching powder is completely dissolved in the water. This will create a 0.5% bleaching solution.

7. Label the container with the contents and concentration of the solution and the date it was prepared for proper identification and safety.

Important Safety Considerations:

- Handle bleaching powder with care, as it can release chlorine gas when it reacts with acidic substances or when exposed to high temperatures.

- Always wear safety goggles and gloves when working with bleaching powder.

- Work in a well-ventilated area to prevent inhaling fumes.

- Do not mix bleaching powder with other chemicals unless you are sure of the compatibility.

- Store the solution in a cool, dark place, away from direct sunlight, and keep it out of reach of children.

This prepared 0.5% bleaching solution can be used for various purposes, such as disinfection and cleaning, but it should be used with caution due to its chlorine content.