Sarah rolls a ball in the grass. The ball starts off moving quickly, starts to slow down, and eventually stops. Using the words
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Taking into account the definition of molarity, the concentration of Na₃PO₄ in solution is 0.192.
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 is expressed in units .
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:
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:
Solving:
Molarity= 0.192
Finally, the concentration of Na₃PO₄ in solution is 0.192.
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