A mixture of NaCl, SiO2, and CaCO3 is separated following the procedure given in this experiment. Indicate how each of the following procedural changes would affect the amount of the specified substance recovered. Briefly explain. Hint: Refer to Table 1 for Solubility & Reactivity The recovery of CaCO3 was attempted by adding 3M H2SO4 instead of 3M HCl to the SiO2/CaCO3 residue.
A mixture of NaCl, SiO2, and CaCO3 is separated following the procedure given in this experiment. Indicate how each of the following procedural changes would affect the amount of the specified substance recovered. Briefly explain. Hint: Refer to Table 1 for Solubility & Reactivity The recovery of CaCO3 was attempted by adding 3M H2SO4 instead of 3M HCl to the SiO2/CaCO3 residue.
Chemistry
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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A mixture of NaCl, SiO2, and CaCO3 is separated following the procedure given in this experiment. Indicate how each of the following procedural changes would affect the amount of the specified substance recovered. Briefly explain. Hint: Refer to Table 1 for Solubility & Reactivity
The recovery of CaCO3 was attempted by adding 3M H2SO4 instead of 3M HCl to the SiO2/CaCO3 residue.
Expert Solution
Step 1
- First dissolve the NaCl in distilled water,leaving a residue of insoluble silicon dioxide and CaCO3.Then add dilute HCl solution to the residue which will react with the CaCO3 to form calcium chloride which is water-soluble .Filtration will leave behind the SiO2 and by adding sodium or potassium carbonate to the CaCl2 solution can recover the CaCO3.
- If use sulfuric acid instead of HCl, it will form calcium sulfate which is not very soluble in water.(CaCl2 is very water soluble,CaSO4) so most of the calcium carbonate will form calcium sulfate and remain behind with the SiO2 and the amount recovered will be less than it should be.
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