3. Acid-free paper is often used for documents intended to last more than 50 yea

Question

3. Acid-free paper is often used for documents intended to last more than 50 years. One source of acidity in paper is a chemical called papermaker's alum,Al(SO4)3 18H20. Papermaker's alum is added during the manufacturing of paper to give extra strength to the paper. In water, papermaker's alum dissociates and one product is the hexaaquaaluminiumII) ion, AI(Th in can undergo acid hydrolysis as shown below (a) What side of the chemical equation is favored at equilibrium for the reaction between hexaaquaaluminium(IIl ion and water? 2+ Hexaagmaaluminiam) lon (pk-5.0) Water (pk 157 Hydronium lon (pk-1.74) (b) If Ho+ is a product why does paper not deteriorate quickly?

Explanation / Answer

smaller the pKa value higher is the acidity since H3O+ has small pKa value so H3O+ has high acidity.so its dissociation will be favour in equilibrium compared to hexaquaaluminium(III) ion and H2O.So equilibrium shifted to backward direction making H2O as the product.so that is why paper do not deteriorate quickly

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