If the solute is 28 index and you wish the solution to be 3 gallons of 3%, how many ounces of solute will you need?

To determine the required amount of solute for a 3-gallon solution at a 3% concentration using a solution with a 28 index, it is essential to use some calculations based on the volume and concentration desired.

First, convert the volume of the solution from gallons to ounces, since solutes are often measured in ounces. A gallon is equivalent to 128 ounces, so 3 gallons will be:

3 gallons × 128 ounces/gallon = 384 ounces.

Next, to find the amount of solute needed to create a 3% solution, use the following calculation:

Amount of solute = Volume of solution × Desired concentration

= 384 ounces × 0.03 (3% in decimal form)

= 11.52 ounces of actual formaldehyde concentration needed.

Now, since the solute is a formaldehyde solution with a 28 index, it contains 28% formaldehyde by volume. To find the amount of the 28-index solute required to achieve the 11.52 ounces of actual formaldehyde, use the formula:

Amount of 28-index solute = Amount of formaldehyde needed / Concentration of formaldehyde in the solution

= 11.