Question

Rubbing alcohol is sold over the counter as a topic (skin) antiseptic. Rubbing alcohol is typically 70% (w/v) iso-propyl alcohol, CaH-OH, in water. How much of this solution can you prepare with 500 mL of pure C3H7OH?

Answer 1

To prepare a 70% (w/v) solution of iso-propyl alcohol, we will need to calculate the amount of iso-propyl alcohol in the final solution.

Let x be the total volume of the 70% solution we want to prepare.

The amount of iso-propyl alcohol in the solution can be calculated using the following equation:

0.7x = 500 mL (pure iso-propyl alcohol)

Solving for x, we get:

x = 500 mL / 0.7 = 714.29 mL

Therefore, you can prepare 714.29 mL of the 70% (w/v) solution with 500 mL of pure iso-propyl alcohol.