How to dilute 9% vinegar for fighting lice and nits? - briefly
Mix the 9 % acetic acid solution with an equal volume of water to obtain approximately a 4.5 % concentration, then apply the diluted mixture to the scalp and hair, allowing it to sit for ten minutes before rinsing thoroughly. This concentration effectively loosens lice and nits while minimizing irritation.
How to dilute 9% vinegar for fighting lice and nits? - in detail
A 9 % acetic acid solution must be reduced to a concentration that is safe for scalp contact while retaining enough acidity to dissolve the cement that attaches lice eggs. The target strength is typically 2–3 % for topical use.
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Determine the desired final volume (V_f) and concentration (C_f).
Example: 500 ml of a 2.5 % solution. -
Calculate the volume of the original 9 % vinegar (V_i) required using the dilution equation C_i × V_i = C_f × V_f, where C_i = 9 % and C_f = 2.5 %.
V_i = (2.5 % × 500 ml) / 9 % ≈ 139 ml. -
Measure 139 ml of the 9 % vinegar with a calibrated container.
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Add distilled or filtered water to reach the total volume of 500 ml.
Water volume = V_f − V_i = 500 ml − 139 ml = 361 ml. -
Mix thoroughly to ensure uniform distribution of acetic acid.
Safety considerations:
- Use gloves and eye protection when handling the concentrated vinegar.
- Perform the dilution in a well‑ventilated area to avoid inhaling vapors.
- Label the container with concentration, preparation date, and intended use.
- Store the diluted solution at room temperature, away from direct sunlight, for no longer than two weeks.
Application protocol:
- Apply the solution to dry hair, saturating the scalp and hair shafts.
- Allow a contact time of 10–15 minutes; the acidity weakens the glue that secures nits.
- Comb the hair with a fine‑toothed lice comb, removing detached eggs and insects.
- Rinse thoroughly with lukewarm water.
- Repeat the treatment after 7 days to eliminate any newly hatched lice.
The described method yields a precise, low‑strength acetic acid preparation suitable for safe, effective lice and nit removal. «Proper dilution ensures efficacy while minimizing irritation to the scalp.»