Question

Which statement best describes the process of making a solution by diluting a stock solution?

Add more solute to decrease the concentration.
Add more solute to increase the concentration.
Add more solvent to decrease the concentration.
Add more solvent to increase the concentration.

Answer 1

Answer: Add more solvent to decrease the concentration.

Step-by-step explanation:

Binary Solution is a homogeneous mixture of two components called as solute and solvent. Solute is the component which is present in smaller proportion and is solid for solid in liquid solution and solvent is the component which is present in larger proportion and is liquid for solid in liquid solution.

Concentrated solution is one in which there is more amount of solute.

Dilute solution is one in which there is more amount of solvent.

According to the neutralization law,

`M_1V_1=M_2V_2`

where,

`M_1` = molarity of stock solution

`V_1` = volume of stock solution

`M_2` = molarity of diluted solution

`V_2` = volume of diluted solution

Therefore, as the moles will remain same, if the volume increases, the concentration decreases.

Answer 2

The correct option is C, that is, add more solvent to decrease the concentration. A stock solution is a concentrated form of a particular chemical. To make a solution from the stock solution, a required amount of the stock solution has to be taken out and this will be diluted with pre-calculated amount of the correct solvent [depending on the desired concentration] in order to produce a diluted form of the stock solution.