1. What Is The Dilution Formula?

The dilution formula calculates the volume of water needed to dilute 91% isopropyl alcohol (IPA) to achieve a 70% concentration, which is commonly used for disinfection purposes.

2. How Does The Calculator Work?

The calculator uses the dilution formula:

Where:

• \( V_{water} \) — Volume of water to add (mL)
• \( V_{ipa} \) — Volume of 91% IPA (mL)
• 91 — Initial concentration of IPA (%)
• 70 — Desired concentration of IPA (%)

Explanation: The formula calculates the exact amount of water needed to reduce the concentration from 91% to 70% while maintaining the alcohol's effectiveness for disinfection.

3. Importance Of Proper Dilution

Details: Proper dilution is crucial for effective disinfection. While 91% IPA evaporates too quickly, 70% concentration provides optimal antimicrobial activity with sufficient contact time on surfaces.

4. Using The Calculator

Tips: Enter the volume of 91% IPA you have in milliliters. The calculator will determine the precise amount of water needed to achieve 70% concentration. Use distilled water for best results.

5. Frequently Asked Questions (FAQ)

Q1: Why dilute 91% IPA to 70%?
A: 70% IPA is more effective for disinfection as it penetrates microorganisms more effectively and evaporates slower than higher concentrations.

Q2: Can I use tap water for dilution?
A: While tap water can be used, distilled water is recommended to avoid mineral deposits and potential contamination.

Q3: How should I mix the solution?
A: Add the calculated water volume to your container first, then add the 91% IPA to minimize splashing and ensure proper mixing.

Q4: Does temperature affect the dilution?
A: Room temperature mixing is sufficient. Extreme temperatures are not required for this dilution process.

Q5: How should I store the diluted solution?
A: Store in a tightly sealed container away from heat and flames. Label clearly with concentration and date of preparation.