Taking into account the definition of molarity and molar mass, the amount of mass of EDTA needed to make 329.5 mL of a 0.03 M EDTA solution is 3.69699 grams.
Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
[tex]molarity=\frac{number of moles}{volume}[/tex]
Molarity is expressed in units .
Definition of molar mass
The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
In this case, you need to make 329.5 mL of a 0.03 M EDTA solution. Then, you know:
Replacing in the definition of molarity:
[tex]0.03 M=\frac{number of moles}{0.3295 L}[/tex]
Solving:
0.03 M× 0.3295 L= number of moles
number of moles= 0.009885 moles
Now, knowing that the molar mass of EDTA is 374[tex]\frac{grams}{mole}[/tex], the mass of EDTA needed is calculated by:
0.009885 moles×374[tex]\frac{grams}{mole}[/tex]= 3.69699 grams
Finally, the amount of mass of EDTA needed to make 329.5 mL of a 0.03 M EDTA solution is 3.69699 grams.
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