Question

Rubbing alcohol is commonly used as an antiseptic for small cuts. It is sold as 70%(v/v) solution of isopropyl alcohol in water. What volume of isoproyl alcohol is used to make 500ml of rubbing alcohol​

Answer 1

Answer:

Ethanol, the most common alcohol ingredient, appears to be the most effective alcohol against viruses, whereas propanol is considered a better bactericidal alcohol. The combination of alcohols may also have a synergistic effect.

Answer 2

Given:

The strength of isopropyl alcohol = $70\%$

The volume of rubbing alcohol = $500$ ml

To find:

The volume of isopropyl alcohol is used to make $500$ ml of rubbing alcohol

Formula:

$Percent\;by\;volume\;=\;\frac{Volume\;of\;solute}{Volume\;of\;solution}\;\times\;100$

Explanation:

The volume of isopropyl alcohol present in $500$ mL of rubbing alcohol  

The volume of solute ⇒ $\frac{70}{100}\;\times\;500$

The volume of isopropyl alcohol = $350$ ml

Answer:

The volume of isopropyl alcohol present in $500$ mL of rubbing alcohol is $350$ ml