Taking into account the definition of molarity, the concentration of Na₃PO₄ in solution is 0.192
.
<h3>Definition of molarity</h3>
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:
![Molarity=\frac{number of moles}{volume}](https://tex.z-dn.net/?f=Molarity%3D%5Cfrac%7Bnumber%20of%20moles%7D%7Bvolume%7D)
Molarity is expressed in units
.
<h3>Concentration of Na₃PO₄ in solution</h3>
Being the molar mass of Na₃PO₄ 163.94 g/mole, that is, the amount of mass that a substance contains in one mole, the amount of moles that contains 23.6 g sample of Na₃PO₄ is calculated as:
![23.6 gramsx\frac{1 mole}{163.94 grams} = 0.144 moles](https://tex.z-dn.net/?f=23.6%20gramsx%5Cfrac%7B1%20mole%7D%7B163.94%20grams%7D%20%3D%200.144%20moles)
Then you know:
- number of moles= 0.144 moles
- volume= 750 mL= 0.750 L (being 1000 mL= 1 L)
Replacing in the definition of molarity:
![Molarity=\frac{0.144 moles}{0.750 L}](https://tex.z-dn.net/?f=Molarity%3D%5Cfrac%7B0.144%20moles%7D%7B0.750%20L%7D)
Solving:
Molarity= 0.192![\frac{moles}{lliter}](https://tex.z-dn.net/?f=%5Cfrac%7Bmoles%7D%7Blliter%7D)
Finally, the concentration of Na₃PO₄ in solution is 0.192
.
Learn more about
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