Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Transcribed Image Text:13. All of the precipitate clinging to the inside of the beaker and the stir rod must also be transferred to the
beaker. Using your wash bottle rinse 4 times, each with about 5 mL of deionized water. This usually
suffices to transfer all of the precipitate to the crucible. Rinse any solid clinging to the stir rod into the
crucible. When you are finished, the beaker should look perfectly clean. Have an instructor check it so you
get the technique mark assigned to this.
14. Measure 5 mL of methanol (located in the fume hood) into a small, graduated cylinder. Separate the white
plastic quick connectors on the rubber tubing to break the suction. Pour the methanol into the crucible,
swirl gently, then reconnect the plastic quick connectors so that the methanol is pulled through into the
suction flask. Repeat this procedure with another 5 mL portion of methanol then leave the crucible under
suction for 1 to 2 minutes.
15. Before turning off the aspirator's water tap, separate the quick connectors. Do not turn off the water first!
Then carefully remove the crucible from its rubber holder. (OBSERVATIONS)
16. Place the crucible in the oven that you collected it from for 30 minutes. The temperature is set to 150 °C.
You can work on the lab report while you are waiting.
17. After 30 minutes, using a heat resistant glove, remove the crucible from the oven. Place the crucible in the
desiccator and secure the lid. Allow it to cool to room temperature (~20 minutes). When it is at room
temperature, weigh it on the same analytical balance as you used previously.
18. Calculate the mass of the precipitate after the heating / cooling cycle and record this mass in Table 1.
Transcribed Image Text:The calcium carbonate sample is heated in the oven for 30 minutes, cooled, and then weighed. What
could you do to ensure that the crucible and precipitate are dry?
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