you are asked to make a 0.3M Calcium chloride solution in a flask that can hold 200ml.How would you do it.

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To make a 0.3M Calcium chloride solution in a 200mL flask, you will need to follow these steps:

1. Calculate the amount of Calcium chloride needed:
- Determine the molecular weight of Calcium chloride. The molecular weight of Calcium chloride is 111 grams/mole.
- Calculate the amount of Calcium chloride needed to make a 0.3M solution using the equation:
Amount (in grams) = molarity (M) x volume (L) x molecular weight (g/mol)
Amount = 0.3 moles/L x 0.2 L x 111 g/mol

2. Weigh the calculated amount of Calcium chloride using a balance:
- Using a balance, measure and weigh the calculated amount of Calcium chloride in grams. Make sure to use appropriate safety precautions like wearing gloves and protective eyewear.

3. Add Calcium chloride to a container:
- Carefully add the weighed amount of Calcium chloride to a clean, dry container that has the capacity to hold at least 200mL of solution.

4. Add distilled water to the container:
- Gradually add distilled water to the container while stirring continuously to dissolve the Calcium chloride completely. Add enough water to reach the 200mL mark on the flask.

5. Mix thoroughly:
- Once the Calcium chloride is fully dissolved, mix the solution thoroughly to ensure proper distribution.

It is important to note that Calcium chloride can be a highly hygroscopic substance, meaning that it readily absorbs moisture from the air. Therefore, it is advisable to work with Calcium chloride in a dry environment and store the solution in a tightly sealed container to prevent dilution or degradation over time.