What mass of water should be added to 10 g of 80% vinegar essence to obtain a 3% solution?

1) Find the mass of the solute. To do this, we multiply the mass fraction of the substance by the mass of the solution and divide by one hundred percent: 10 * 80/100 = 8g.
2) Find the mass of the solution in a 3% solution. To do this, we multiply the mass of the solute by one hundred percent and divide by the mass fraction: 8 * 100/3 = 266.7 g.
3) Find the mass of added water. To do this, subtract the mass of the original solution from the mass of the solution with a mass fraction of 3%: 266.7 – 10 = 256.7 g – the answer.