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Controlling the concentration-time for calculations

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Reference no: EM132560707

Controlling the Concentration - Time for calculations!

Press Reset. Select nickel (II) chloride (NiCl2).

1) Making a Solution at a certain concentration. Add enough powder to get a 0.4 Molar Solution in the ½ liter of water originally in the beaker. (If you overshoot the mark, use the "remove solute" button and try again).

Record the actual concentration that you got (as close to 0.4 M as you can get): ____0.4____

Now calculate the number of moles of NiCl2 that you shook into your beaker. Show your conversion below. Remember, you have ½ L solution (0.5 L) and your concentration is

Note: Moles and Molarity are not the same thing.

The abbreviation for moles is mol.

The abbreviation for molarity is M.

To calculate moles:

Use volume (in L) times M in (moles/L)

The liters will cancel to give you moles:

Show calculation here. Include units.

2) Dilute a Solution. Use V1C1 = V2C2 to predict what the concentration will be if you dilute the .5 L of your .4 M solution by adding water to make a 1L solution. Show your calculation set up and your answer:

Show calculation here: (Start with the formula. Plug in the numbers with units.)

See if you got the correct value. Do the dilution by adding water to the beaker up until the 1 L mark. What is the concentration according to the meter?

3) Concentrate a Solution. Predict the concentration if the solution is now concentrated (by using evaporation) to a volume of .6 liters (one dash above the ½ L mark). Show the calculation of this concentration using the V1C1 = V2C2 formula.

Show calculation here:

After you make the calculation: Evaporate water with Evaporation Slider Bar at the bottom until there is .6 liter of solution in the beaker. What is the concentration?

From the volume and concentration, calculate the number of moles** of solute in the solution. Show your calculation with units.

How does the # moles of solute compare to the # of moles of solute calculated in question 1. Explain why these numbers compare as they do.

Reference no: EM132560707

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