Taking into account the definition of dilution, the initial volume of the 1 M HNO₃ solution is 25 mL.
When it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.
Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Assuming that you want to know the volume of HNO₃ required to produce the dilution, you know:
Replacing in the definition of dilution:
1 M× Vi= 0.250 M× 100 mL
Solving:
Vi= (0.250 M× 100 mL)÷ 1 M
Vi= 25 mL
In summary, the initial volume of the 1 M HNO₃ solution is 25 mL.
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