It seems like you're asking about a 19% acid solution. Here's how to calculate the amount of pure acid:

Understanding the Problem:

* A 19% acid solution means that 19% of the total volume is pure acid.

* We need to find the volume of pure acid in 860 milliliters of the solution.

Calculation:

1. Convert the percentage to a decimal: Divide 19 by 100, which equals 0.19.

2. Multiply the decimal by the total volume: 0.19 * 860 milliliters = 163.4 milliliters

Answer: There are 163.4 milliliters of pure acid in 860 milliliters of a 19% acid solution.