A student rushed through this experiment. Describe the effect that the following
ID: 482941 • Letter: A
Question
A student rushed through this experiment. Describe the effect that the following procedural changes would have. Briefly explain your reasoning behind each answer. A) An impatient lab student plunges his hot, totally dissolved solution into an ice-water bath to get the crystals out quickly. What could happen to force the student to restart the entire experiment? B) An impatient lab student plunges his hot, totally dissolved solution into an ice-water bath to get the crystals out quickly. Comment on the purity of the recrystallized product (assuming he doesn’t have to restart). A student rushed through this experiment. Describe the effect that the following procedural changes would have. Briefly explain your reasoning behind each answer. A) An impatient lab student plunges his hot, totally dissolved solution into an ice-water bath to get the crystals out quickly. What could happen to force the student to restart the entire experiment? B) An impatient lab student plunges his hot, totally dissolved solution into an ice-water bath to get the crystals out quickly. Comment on the purity of the recrystallized product (assuming he doesn’t have to restart). A) An impatient lab student plunges his hot, totally dissolved solution into an ice-water bath to get the crystals out quickly. What could happen to force the student to restart the entire experiment? B) An impatient lab student plunges his hot, totally dissolved solution into an ice-water bath to get the crystals out quickly. Comment on the purity of the recrystallized product (assuming he doesn’t have to restart).Explanation / Answer
From A and B:
adding hot dissolved solution of salts (ions in solution) to the ICE, i.e. a very low temperature mix... will:
- Force crystalization
- The extreme change in temperature will not favour a correct crystalisation, that is, some material might even "capture" bubbles or other sediment inside the crystals, therefore, they will be marked as "impure"
If he does not restart, he will have a higher yield than expected, since it will account for all the impurities as well
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