Final answer:
During a hot filtration step of a recrystallization, it is important to keep all glassware hot to prevent premature crystallization and clogging of the filter paper. Heating the glassware helps maintain the solubility of the compound being purified and ensures successful recrystallization. The use of borosilicate glassware reduces the risk of thermal shock and prevents the glassware from breaking during heating.
Step-by-step explanation:
During the hot filtration step of a recrystallization, it is important to keep all glassware hot to prevent the formation of crystals and clogging of the filter paper. Heating the glassware keeps the solvent and the compound being purified in a liquid state and prevents premature crystallization. The hot glassware also helps maintain the solubility of the compound, making it easier to filter and separate from impurities.
A common technique used to purify compounds is fractional crystallization, which relies on the compound being more soluble at high temperatures. Lowering the temperature causes the compound to crystallize out of solution, while impurities remain dissolved. By keeping the glassware hot during the hot filtration step, we ensure that the compound remains in solution and does not crystallize prematurely, allowing for a successful recrystallization process.
Additionally, it is important to use borosilicate glassware, such as Pyrex or Kimax, for heating. Borosilicate glass can withstand rapid temperature changes without breaking due to its low coefficient of linear expansion. This reduces the risk of thermal shock and prevents the glassware from cracking during the heating process.