A 85 mg sample of Red 40 dye was dissolved and diluted to a final volume of 0.75 L with deionized water. What is the concentration of this solution in ppm

The concentration of this solution is 133.33 ppm

Explanation:

The Parts per million (ppm) is a unit of measure of concentration that refers to the amount of units of substance that exist for every million units in the set.

It is a unit used to measure the presence of elements in small quantities, that is, traces.

In the case of water, or any solvent of density equal to 1 kg / L as in this case, ppm also indicates the mg (milligrams) in a kg (and since the density is 1 kg / L, one kg matches one liter) of dissolution.

Then the concentration in ppm (mass / volume) would be:

The concentration of this solution is 133.33 ppm

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation: