Vermont Barbers and Cosmetologists Practice Exam

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What is the appropriate concentration of isopropyl alcohol for disinfecting tools?

At least 50% isopropyl alcohol

At least 70% isopropyl alcohol

The appropriate concentration of isopropyl alcohol for disinfecting tools is at least 70%. This concentration is particularly effective because it has been found to penetrate the cell walls of bacteria and viruses more effectively than higher concentrations. While higher percentages, such as 90%, can be effective at quickly killing germs, they evaporate too quickly to allow for adequate contact time, which is essential for proper disinfection. Lower concentrations, below 70%, do not contain enough isopropyl alcohol to effectively denature proteins and kill microorganisms. Thus, using at least 70% isopropyl alcohol ensures effective disinfection while maintaining the right balance for adequate contact time.

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At least 90% isopropyl alcohol

Any concentration is effective

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