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# Dilution; Kandai & Amall

Dilution- The process of making a substance weaker or less concentrated.

• Dilution refers to the process of adding additional solvent to a solution to decrease its concentration.
• The less concentrated a substance is, the more diluted it is.
• Example: When adding sugar to kool-aid and continuously adding more water to it to weaken the sweetness of the sugar.
• For dilutions, use this formula:
• M1V1 = M2V2
• M1 = initial molarity M2 = final molarity
• V1 = initial volume V2 = final volume
• Example
• 175 mL of a 1.6 M aqueous solution of LiCl is diluted with water to a final volume of 1.0 L. What is the final concentration of the diluted solution?
• M1V1=M2V2
• (1.6 M)(175 mL) = M2(1000 mL)
• (1.6M)(175M)/(1000mL)=M2
• M2 = 0.28 M

Quiz:

1.) If I have 340 mL of a 0.5 M NaBr solution, what will the concentration be if I add 560 mL more water to it?

2.) If I dilute 250 mL of 0.10 M lithium acetate solution to a volume of 750 mL, what will the concentration of this solution be?

3.) If I leave 750 mL of 0.50 M sodium chloride solution uncovered on a windowsill and 150 mL of the solvent evaporates, what will the new concentration of the sodium chloride solution be?

4.) To what volume would I need to add water to the evaporated solution in problem 3 to get a solution with a concentration of 0.25 M?

5.) What is the dilution formula?