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Solve the following problems and write your answer in the space provided.
2. What is the molarity of a hydrochloric acid solution that has a volume of 1500
mL and contains 441 g of HCI?

Respuesta :

Taking into account the definition of molarity, the molarity of the solution is 8.066 [tex]\frac{moles}{liter}[/tex].

Definition of molarity

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 [tex]\frac{moles}{liter}[/tex].

Molarity of a hydrochloric acid solution

In this case, you know:

  • number of moles= 441 g× [tex]\frac{1mole}{36.45 g}[/tex]= 12.099 moles (being 36.46 [tex]\frac{g}{mole}[/tex] the molar mass of NaNO₃, this is,the amount of mass that a substance contains in one mole.)
  • volume= 1500 mL= 1.5 L (being 1000 mL= 1 L)

Replacing in the definition of molarity:

[tex]Molarity=\frac{12.099 moles}{1.5 L}[/tex]

Solving:

molarity= 8.066[tex]\frac{moles}{liter}[/tex]

Finally, the molarity of the solution is 8.066 [tex]\frac{moles}{liter}[/tex].

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