Question

What should we do after we add the CaCl₂ to the vial?

Answer 1

After adding CaCl₂ to the vial, it is important to dissolve it in distilled water, prepare a solution up to a specified volume, and then mix the solution homogeneously. The moles of CaCl₂ and properties like the freezing point can then be calculated for further experiments.

Step-by-step explanation:

After adding the CaCl₂ to the vial, the steps that should be followed typically include ensuring the solubility of the salt in the solvent and checking the properties of the resulting solution such as molality, freezing point, and boiling point. If the experiment is to find out how many grams of CaCl₂ are contained in 250.0 mL of a 0.200-M solution of calcium chloride, one should:

1. Weigh the appropriate mass of solute (CaCl₂).
2. Add distilled water to half-fill a volumetric flask and dissolve the solute in it.
3. Fill the volumetric flask to the etched line with more distilled water.
4. Cap and invert the flask several times to ensure the solution is homogeneously mixed.

The moles of CaCl₂ can be determined and used alongside the properties of the solution such as freezing point and boiling point for further calculations in the experiment.