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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.
Step by step
Solved in 2 steps
- In a test tube, dissolve 10 drops of methanol in 3 ml. of water. Oxidize a copper wire spiral by passing it through a Bunsen burner. Plunge the red-hot wire into the alcohol solution several times, cooling the solution under the tap (faucet) so as not to evaporate too much of it. Next, add 1 drop of 0.5% resorcinol solution. Measure 2 ml. of concentrated sulfuric acid (CAUTION!) and pour this carefully down the sides of the test tube containing the mixture. Note the color of the zone intermediate between the acid and the solution. RESULT:Weigh out 5g of table salt. Dissolve it in 50mL of distilled water in a container using a stirrer and label appropriately. Calculate the concentration in terms of percent mass per volume.What are the differences between a simple distillation and steam distillation?
- What is another factor that can influence fractional distillation’s success other than the number of theoretical plates?Why is fractional distillation more efficient than simple distillation when purifying liquid mixtures?Differentiate between simple distillation and fractional distillation. Please elaborate.
- Which of the following statements is true when considering temperature during a recrystallization? More than one answer may be correct. Using ice to cool the sample will speed up the crystallization process so that large crystals will be formed. It is important that the sample is dissolved in just enough hot solvent. O Ideally the hot solvent used will keep the impurities dissolved OR not dissolve them at all. Enough cold solvent should be added to dissolve the sample BEFORE heating it past its boiling point.Chemistry Which lab technique(s) can be performed on solid, somewhat soluble samples? Melting Range Determination or Recrystallization. Melting Range Determination. Not Recrystallization. Neither Recrystallization nor Melting Range Determination. Recrystallization. Not Melting Range Determination.What will happen if the recrystallization mixture is cooled very quickly so that crystals form very rapidly? small pure crystals will form the impurities will stay in solution small impure crystals will form O large impure crystals will form
- Write the dispersion medium and dispersed phase in milk.What is meant by water hardness? Explain the difference between temporary and permanent hardness.Using recrystallization techniques, a student attempts to purify 0.50 g of compound H. Based on the solubility of H in the chosen solvent at collection temperature, the maximum percent recovery is 82%. The student obtains 0.396 g of purified crystals. What is their percent recovery? Group of answer choices 41% 64% 79% 82% 97% none of these