If using a magnetic stir bar, be sure that it is clean.For example, if you need to make 50 mL of a solution, it is preferable to use a 50 mL graduate cylinder, but a 100 mL cylinder can be used if necessary. Always use a graduate cylinder to measure out the amount of water for a solution, use the smallest size of graduated cylinder that will accommodate the entire solution.
2 H 2O has a MW of 147.0 grams (110.0 g + the weight of two waters, 18.0 grams each). For example, anhydrous CaCl 2 has a MW of 111.0 g, while the dehydrate form, CaCl 2 Be sure to pay attention to which one you are using. Others come as “anhydrous” which means that there is no bound water. Some chemicals come as hydrates, meaning that those compounds contain chemically bound water. Be sure you are using the right form of the chemical for the calculations. Make sure to always research the precautions to use when working with specific chemicals. Key considerations when making solutions:
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