A Quick Recap:

Solvent = the liquid that does the dissolving

Solute = the substance which dissolves

Solution = is prepared by dissolving a solute in a solvent.

- When a solution is diluted more solvent is added to it.

- The moles of solute is always constant (the only difference is that there is more solvent in the less concentrated solution)

The total number of solutes in the solution remains the same after dilution, but the volume of the solution becomes greater. |

Thus we have the equation:

Moles of solute before = Moles of solute after

M

_{1}V_{1}= M_{2}V_{2}Lets

_{ }try an example:Concentrated HNO

_{3}is 15.4 mole/L. How would you prepare 2.50 L of 0.375 M HNO_{3}?M

_{1}V_{1}= M_{2}V_{2}15.4 mole/L x V

_{1}= 0.375 M x 2.50 L→ Re organize the equation

V

_{1}=__0.375 M x 2.50 L__ 15.4 M

V

_{1}= 0.0609 LV

_{1}= 60.9 mL*Remember Sig Figs

To calculate how much water we need in order to dilute the solution we take our known volume (V

_{2}) and subtract it from V_{1}. 2.50 L – 0.0609 L = 2.44L

So, you would need to add 2.44 L of water to make the equation true.

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By Candace

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