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Why is it best to cool the crucible and lid and sample in a desiccator rather than on a laboratory bench?
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Who long you can left the simple in the desiccator?
I think you should resubmit this question as How long can you leave a sample in a desiccator? and it would help if you gave information about what sample you are putting in.
Why should the dried sample be kept in desiccator for cooling?
If a dried sample is warm, it will absorb water from the air while cooling. Placing it in a desiccator puts it in a dry atmosphere where no moisture is available to be absorbed from the air.
What is a desiccant?
The definition of desiccant is a substance that has hygroscopic properties. It is a drying agent, and it will remove moisture from the air. Desiccants are often packaged with moisture-sensitive products to make sure they have a dry atmosphere.
What will happen if a crucible containing a sample is heated with a very hot flame causing the sample to splatter out in a chemistry experiment?
The experimenter could get burned by the hot or caustic sample.
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What is sulphated ash?
The sulphated ash test is an analytical test for determining the inorganic content of a sample by weight. The sample ( usually 1g) is accurately weighed into a platinum, silica crucible that has been previously ignited, cooled and weighed. The sample in the crucible is then subjected to sulphuric acid (usually 1mL) and charred at a low temperature without causing ignition of the sample until there are no more white fumes given off. The crucible with the charred sample is then placed in a furnace (temperature is dependent on monograph but typically it can be from 600 to 900 degrees celcius) until all organic matter has been burnt off. The crucible is cooled and re-weighed. The difference in sample weights being the sulphated ash content remaining. Some monographs require the sample to be re-ashed until a constand weight has been achieved. The remaining inorganic matter is typically metal oxides from most samples.
What is a drying oven?
A drying oven is used in a chemical laboratory for dehydrating a sample of material.
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If A 2.50-gram sample of calcium metal is heated in a 38.500 gram crucible to form a calcium oxide. if the crucible and product weigh 38.850 g what is the empirical formula for calcium oxide?
Calcium oxide is CaO.
