Re: Need help in calculating chloride % or ppm...
When calculating the percent composition of any component in a compound, you must keep in mind molecular weights. Here is an example:
To calculate the percent by weight of sodium and chloride in sodium chloride:
-molecular weight Na=22.99; molecular weight Cl=35.45
-Calculate the total mass of Na present:
1 Na is present in the formula, mass = 22.99
-Calculate the percent by weight of Na in NaCl:
%Na = (mass Na ÷ MM) x 100 = (22.99 ÷ 58.44) x 100 = 39.34%
-Calculate the total mass of Cl present:
1 Cl is present in the formula, mass = 35.45
-Calculate the percent by weight of Cl in NaCl:
%Cl = (mass Cl ÷ MM) x 100 = (35.45 ÷ 58.44) x 100 = 60.66%
-39.34 + 60.66=100%
This formula can be followed to determine the percent composition.