Question

Rubbing alcohol is sold as 70% (v/v) solution of isopropyl alcohol in water. What volume of isopropyl alcohol is used to make 5oo mL of rubbing alcohol?

Answer 1

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It is sold as 70% (v/v) solution of isopropyl alcohol in water. What volume of isopropyl alcohol is used to make 500 mL of rubbing alcohol? 350 mL of isopropyl alcohol is used to make 500 mL of 70% (v/v) rubbing alcohol. Usually mass/mass relationships

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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

⇒ $\frac{70}{100}\;\times\;500$

The volume of isopropyl alcohol = $350$ ml

Answer:

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