PPM=no of parts of the component/total no of parts of allcomponent *10^6=
.2/500 *10^6=400ppm
Hope it helps!!!

Calculation of Fluorine Concentration in ppm

To calculate the concentration of fluorine in parts per million (ppm) level, we need to follow the given formula:

PPM = (mg of solute / g of solution) x 10^6

Given, the toothpaste sample weighs 500g and has 0.2g of fluoride concentration.

Firstly, we need to convert the fluoride concentration to milligrams (mg).

1g = 1000mg

0.2g = 0.2 x 1000mg = 200mg

Now, we can substitute the values in the formula to get the ppm level of fluorine concentration.

PPM = (200mg / 500g) x 10^6
= 400 ppm

Therefore, the concentration of fluorine in the given toothpaste sample is 400 ppm.

Explanation

Parts per million (ppm) is a unit of concentration used to express very small concentrations of a solute in a solution. It indicates the number of units of solute present in 1 million units of the solution. It is calculated by dividing the mass of the solute by the mass of the solution and then multiplying by 10^6.

In this case, we are given the weight of the toothpaste sample and its fluoride concentration. To calculate the concentration of fluorine in ppm, we need to convert the fluoride concentration from grams to milligrams and then substitute the values into the formula.

The result obtained indicates that for every 1 million units of the toothpaste sample, there are 400 units of fluoride present. This concentration level is within the safe range for toothpaste as recommended by the American Dental Association.