Which would affect the accuracy of a melting point determination? Using a thermometer that has not been pre-calibrated. Water or impurities in the sample. Raising the temperature too fast. All of these.
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Which would affect the accuracy of a melting point determination?
- Using a thermometer that has not been pre-calibrated.
- Water or impurities in the sample.
- Raising the temperature too fast.
- All of these.
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Solved in 2 steps
- During melting point determination, what does melting point range means? How will you know if the sample is pure or not?When checking the melting point of your impure sample, what temperature should you set as the starting temperature (the SET temperature) and what should the ramp rate be? For example, if the sample is believed to melt at 70°C, at what temperature should you begin to heat the sample?Write the dispersion medium and dispersed phase in milk.
- A student is asked to prepare 45.0 mg of a sample to be used in a mixed melting point test. The requested composition of the sample is 65.0 % A and 35.0 % B. What is the mass of compound A needed to prepare the sample?When isolating the solid after recrystallization using vacuum filtration what solvent should you use to aid in the rinse from the Erlenmeyer flask to the vacuum filter funnel? (Only pick one answer) Group of answer choices: Cold ethyl acetate Cold ethanol Hot ethyl acetate Hot ethanol Hot water Cold water None of the above, it should not be risnedWhy is it important to cool slowly during recrystallization
- The method of extraction for Roman chamomile is: Choose one answer. a. cold-press extraction b. steam distillation c. water distillation d. solvent extractionWhat are the criteria for a good recrystallization solvent?If you are performing a solvent extraction using 1M NaHCO3 and Dichloromethane (Density = 1.325 g/mL) which layer will be the aqueous layer? Top or bottom layer?
- Describe the errors which may cause an observed melting point range of a PURE sample to be: higher than the correct melting point broad in rangeHow are solvents chosen for recrystallization? (single solvent or mixed-solvent system).What are the properties of a good solvent system? How are crystals collected?You measured the melting point of the recrystallized product Ttal=142,2-145,5°C. Based on this result, what can you say about your sample?