how can I separate NaCl and SiO2 from a mixture
Answers
Answer:
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Explanation:
Extraction of NaCl. Weigh a second, clean, dry, evaporating dish. Add between 5 and 7 mL of distilled water to the NaCl-SiO2 mixture and stir gently for 5 minutes.
Carefully decant the liquid from the first evaporating dish into the second evaporating dish, leaving the solid behind. It is not crucial that all the liquid be transferred at this point. Add 5-7 mL more of distilled water to the first dish and gently stir for 5 minutes.
Decant the liquid into the second evaporating dish. Repeat this process a third time with 5-7 mL more of distilled water. This process effectively extracts the NaCl (now in evaporating dish #2) from the SiO2 (in evaporating dish #1). Both components, however, are impure; the water mixed with each of them must be removed.
Drying of SiO2. Place the evaporating dish containing the wet SiO2 (dish #1) on a clay triangle assembly and slowly heat the mixture with stirring until the lumps break up and the sand appears dry. Now increase the flame and heat so that the bottom of the dish is red. Maintain this heat for 10 minutes. Allow the dish to cool to room temperature and weigh to find the mass of SiO2 in the original sample.
Drying of NaCl. Set the evaporating dish containing the NaCl-water solution on a clay triangle assembly. Gently heat the solution with a low flame at the beginning to avoid boiling the solution too vigorously and losing product. When most of the water is gone, reduce the heat to avoid splattering of the NaCl. It is advisable to place a watch glass over the dish at this point to avoid loss of NaCl. When no water is seen condensing on the watch glass then the sample is dry. Allow the dish to cool and record its mass to find the mass of NaCl in the original mixture.