You know that in case of burns, the affected area is washed with water and then neutralized with an acetic acid solution

You know that in case of burns, the affected area is washed with water and then neutralized with an acetic acid solution. Calculate the mass fraction (in%) of acetic acid in this solution, if 197 g of water and 3 g of acid were taken for its preparation.

CH3COOH + H2O.
Let’s find the mass of the entire solution. To do this, add the mass of water and the mass of acid: 197 + 3 = 200g.
The mass fraction of a substance in a solution is found by dividing the mass of the solute by the mass of the solution. And then we multiply the resulting value by one hundred percent.
W = 3/200 * 100 = 1.5% – the answer.