Question

When preparing a solution in a volumetric flask, a student added water but failed to fill it up to the line on the neck of the volumetric flask leaving the solution short of the mark. How does this affect the concetration of the prepared solution?

Answer 1

We know that Concentration= no.of moles/Volume of solution

let us assume no.of moles is constant in this process . Here Take the volume of flask will be 'V',but here it is filled with <'V'.

In first case :

Concentration (C1) = N/V1

in second case:

Concentration (C2) = N/V2

Here V2<V1

So, concentration in second case will be more compared to first case , this will effect the entire molarity and normality and molality problems going to be wrong ,

So, fill the the flask upto the volume of mark