Question

How can you safely dilute a 35% hydrogen peroxide solution to 3%, and what considerations should be made for storage after opening?

Answer 1

To safely dilute a 35% hydrogen peroxide solution to 3%, follow these steps:

1. **Calculate the Dilution Ratio**: The formula for dilution is C1V1 = C2V2, where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume. In this case, to get a 3% solution from 35%, the dilution factor is C1V1 = C2V2, where C1 = 35%, C2 = 3%, V2 = the final volume you want to achieve, and you can solve for V1.

2. **Use Proper Protective Gear**: Wear gloves and protective eyewear while handling concentrated hydrogen peroxide as it can cause skin irritation and damage.

3. **Measure Carefully**: Using a pipette or graduated cylinder, measure the required volume of the 35% hydrogen peroxide solution needed to achieve the desired final volume for a 3% solution. Add this to a larger volume of water, ensuring proper mixing.

4. **Mix Thoroughly**: Stir or mix the solution well to ensure uniform distribution.

Regarding storage after opening:

- **Store in a Suitable Container**: Transfer the diluted solution to a clean, opaque container, preferably amber or dark in color, to protect it from light exposure. Store it in a cool, dark place.
- **Label Clearly**: Clearly mark the container with the contents and concentration, along with the date of preparation.
- **Securely Seal the Container**: Ensure the lid is tightly closed to prevent evaporation and potential contamination.
- **Keep Out of Reach**: Store the solution out of reach of children or pets.
- **Monitor Expiry Date**: Hydrogen peroxide solutions degrade over time, losing potency. Check the expiration date or prepare fresh batches periodically.

Handling and storing hydrogen peroxide require caution due to its reactive nature and potential for decomposition when exposed to light, heat, or contaminants.

Answer 2

To dilute a 35% hydrogen peroxide solution to 3%, you can use the formula: C1V1 = C2V2. After opening, store the hydrogen peroxide solution in a cool, dark place.

Step-by-step explanation:

To dilute a 35% hydrogen peroxide solution to 3%, you can use the formula:

C1V1 = C2V2

Where C1 and V1 represent the initial concentration and volume, and C2 and V2 represent the final concentration and volume.

For example, if you have 100 mL of the 35% solution and want to dilute it to 3%:

35% x 100 mL = 3% x V2

V2 = (35% x 100 mL) / 3%

V2 = 3500 mL

Therefore, you would need to dilute 100 mL of the 35% solution to 3500 mL to obtain a 3% solution.

After opening, you should store the hydrogen peroxide solution in a cool, dark place. It is important to keep it away from direct sunlight and heat sources to prevent decomposition. Additionally, ensure that the solution is tightly sealed to prevent evaporation or contamination.