You have a .200M solution of NaCl. if you pipette 2.00 mL of the solution into a 25mL volumetric flask and dilute it to the mark, then what is the molarity of the new solution
It's 0.200 M x (2.00/25.00) =
.016
To find the molarity of the new solution, we can use the principle of dilution.
Dilution involves adding a solvent, usually water, to a more concentrated solution to decrease its concentration. The amount of solute (in this case NaCl) remains constant during dilution.
Here's how we can calculate the molarity of the new solution:
1. Calculate the amount of solute transferred.
The amount of NaCl transferred from the original solution to the volumetric flask can be calculated using the formula:
Amount of solute transferred (in moles) = concentration (in M) x volume (in liters)
Given that the concentration is 0.200 M and the volume transferred is 0.00200 L:
Amount of NaCl transferred = 0.200 M x 0.00200 L = 0.0004 moles NaCl
2. Calculate the final volume of the solution.
The final volume of the solution is the sum of the volume transferred and the volume of the volumetric flask.
Final volume = volume transferred + volume of flask = 0.00200 L + 0.02500 L = 0.02700 L
3. Calculate the molarity of the new solution.
The molarity of the new solution can be calculated using the formula:
Molarity (in M) = amount of solute (in moles) / final volume (in liters)
Molarity = 0.0004 moles NaCl / 0.02700 L = 0.0148 M
Therefore, the molarity of the new solution, after dilution, is approximately 0.0148 M.