A possible method that can be utilized to verify you formed the correct product is to confirm the melting point of your synthesized alum product and compare that value to the known melting point of pure alum. Another method of verification is to heat the alum in a crucible, which will drive off the water of hydration. The amount of water driven off, and the amount of dehydrated sample, can be compared to see if they are in agreement with the compound’s formula. If a student gently heats a 0.855 g sample of synthesized alum product in a crucible, and then determines that the mass of the dehydrated sample is 0.465 g, does this data support that the compound is a dodecahydrate, in other words, does this support the presence of the 12 water molecules? Why or why not? Show your work.
A possible method that can be utilized to verify you formed the correct product is to confirm the melting point of your synthesized alum product and compare that value to the known melting point of pure alum.
Another method of verification is to heat the alum in a crucible, which will drive off the water of hydration. The amount of water driven off, and the amount of dehydrated sample, can be compared to see if they are in agreement with the compound’s formula.
If a student gently heats a 0.855 g sample of synthesized alum product in a crucible, and then determines that the mass of the dehydrated sample is 0.465 g, does this data support that the compound is a dodecahydrate, in other words, does this support the presence of the 12 water molecules? Why or why not? Show your work.
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