How to dilute vinegar to 70% for lice? - briefly
Mix one part undiluted vinegar with three parts water to achieve roughly a 70 % solution, then apply the mixture to the infested area using a cotton pad. Verify that the concentration does not cause irritation before use.
How to dilute vinegar to 70% for lice? - in detail
To obtain a solution containing 70 % acetic acid for lice treatment, begin with a concentrated vinegar product, typically 100 % acetic acid or a commercial 20 % solution. The dilution factor is calculated by the ratio of desired concentration to initial concentration.
If the starting material is pure acetic acid (100 %):
- Required volume of pure acid = desired volume × 0.70.
- Add distilled water to reach the final volume.
Example: To prepare 500 ml of a 70 % solution:
- Measure 350 ml of pure acetic acid.
- Add 150 ml of distilled water.
- Mix thoroughly, ensuring uniform distribution.
When the initial vinegar is a 20 % solution:
- Desired concentration (0.70) ÷ initial concentration (0.20) = 3.5.
- This indicates that the final mixture must contain 3.5 parts of the 20 % vinegar for each part of water.
Example: To achieve 250 ml of a 70 % solution:
- Calculate volume of 20 % vinegar: 250 ml ÷ (1 + (1/3.5)) ≈ 175 ml.
- Water volume = 250 ml – 175 ml = 75 ml.
- Combine 175 ml of the 20 % vinegar with 75 ml of distilled water, then stir.
Safety considerations:
- Wear chemical‑resistant gloves and protective eyewear.
- Perform dilution in a well‑ventilated area to avoid inhalation of vapors.
- Label the container with concentration, preparation date, and intended use.
Application guidance:
- Apply the 70 % solution to the scalp using a spray bottle or cotton pad.
- Allow contact for a minimum of 10 minutes before rinsing with lukewarm water.
- Repeat treatment after 7–10 days to address any newly hatched lice.
Storage instructions:
- Keep the solution in a tightly sealed, opaque container to protect from light degradation.
- Store at a temperature below 25 °C; discard after six months.
«Proper dilution ensures the efficacy of the solution while minimizing the risk of skin irritation».