If the melting point range obtained from the unknown sample is 121-122 degrees Celsius, can we say that the unknown sample has high purity? Explain
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- Concerning the following two mixtures, methanol/tetrahydrofuran and chloroform/ethylene glycol, could each mixture be separated using fractional distillation?why is a fractionating column better able to separate liquids?The measured melting point for each of two samples was 89-91 ˚C, yet a 1:1 mixture of the two had a melting point of 77-83 ˚C. What is the explanation for these results?
- Explain how can you use the melting point can be used to determine the purity of a substance.When purifying a sample of aspirin that was produced in the lab, the impure aspirin sample should be dissolved in a very cold solvent, so that solid impurities can be filtered and analyzed the next day or the next week. True or False?Pure aspirin has a melting point of 135-136 °C. Before the melting point was determined - if the sample contains water by absorbing moisture in the air - what effect could this have on the observed melting point from the sample?
- Crystals have precipitated upon cooling a homogeneous solution of a compound. The crystals were then separated by vacuum filtration. Which of the following terms is the best term to correctly to describe the liquid after filtration? Supernatant Solvent Solution Soluble impurities FiltrateThe melting point of aspirin is 135°C. If a melting point range for the synthesized product is 119.5°C to 125.8°C, what can you say about the sample?What unknown solid sample has a melting point range of 78 degrees celcius to 81 degrees celcius? What is the percent error in its melting point?
- 1-propanol, 2-propanol, and 1-butanol all have boiling too close together to be separated using the simple distillation column. What equipment be used to separate a mixture of these three?A student measured the melting point range of an unknown solid to be 81.9 to 82.3 degrees celsius. a) Is the compound pure? b) Can you identify the compound from Table 2.2? c) If yes, what is the compound? Table 2.2: Solid - Melting Point (Celsius) Benzoic Acid - 122 Acentanilide - 114 Acetamide - 82 Biphenyl - 71 p-Dimethoxybenzene - 59 p-Dichlorobenzene - 54 Benzophenone - 48During a laboratory experiment, a student mixed two homogeneous aqueous solutions. After mixing a solid precipitate was formed. What is the best way for the solid to be separated from the solution? Put it in a beaker and heat it. Filter it using a Buchner funnel, filter flask and vacuum pump. Use a pipette to remove the solid from the liquid. Scoop it out with a spatula. The solid cannot be isolated.