1.Zeolites can be synthesized or changed to be in an ‘acidic’ form in which the
ID: 972453 • Letter: 1
Question
1.Zeolites can be synthesized or changed to be in an ‘acidic’ form in which the loosely held cations are H+. What aqueous solution would you use to replace H+ with Na+ and why? Include a balanced equation of reaction in your explanation.
2.A student prepares a sample of Zeolite A by mixing 4.02g NaOH, 1.470g NaAlO2 and 0.950g Na2SiO3 in a total of 50.0 mL Nanopure water. Calculate the theoretical yield and identify the limiting agent. The student recovers 1.08g of product; what was the percent yield?
Explanation / Answer
1-Zeolites are crystalline minerals composed primarily of silica and alumina with a microporous structure.Some zeolites contain soluble charge compensating ions, such as Na+or H+ and these are often used as ion exchange media.Structral formula of Zeolites is given as-M(x/n)(AlO2)x(SiO2)y]mH2O.
Protons contained within the zeolite lattice are Brønsted sites.The H+forms of zeolites can be prepared from alkali ion containing forms by ion exchange with concentrated hydrochloric acid at higher temperatures.These zeolites behave as acid which react with base NaOH.
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