Question

How much pure acid is in 440 milliliters of a 19% solution

Answer 1

Answer:

83.6 mL

Step-by-step explanation:

Given 440 mL of 19% acid solution. This means the whole volume of this acid solution is 100%. Let x mL be the volume of pure acid in this solution.

Then

$440\ mL - 100\%\\ \\x\ mL - 19\%$

Write a proportion:

$\dfrac{440}{x}=\dfrac{100}{19}$

Cross multiply:

$100\cdot x=440\cdot 19\\ \\x=\dfrac{440\cdot 19}{100}\\ \\x=\dfrac{8,360}{100}\\ \\x=83.60\ mL$