Preparation of KAl(SO4)2·12H2O (Alum) OBJECTIVES This experiment aimed to: 1. prepare a "double salt" potassium aluminium sulphate dodecahydrate or alum; 2. study and explain chemical reactions involved in the preparation of KAl(SO4)2·12H2O; 3. describe the characteristics and properties of an alum; and 4. determine the percent yield in the preparation of KAl(SO4)2·12H2O.

compound, alum, which is hydrated potassium aluminum sulfate, KAl(SO4)2•12 H2O. Aluminum beverage cans generally have a thin coating of plastic on the inside that protects the aluminum from the corrosive action of the chemicals in the beverage. The outside usually has a thin coating of paint.

Synonyms: potash alum, tawas, or potassium aluminum sulfate, Aluminium potassium sulfate dodecahydrate. Suited for example for leather tanning, as a dye mordant or as fire retardant in textiles. Customer ratings for Potassium alum (KAl (SO4)2 · 12 H2O) Number of ratings: 2. Average rating:

KAl(SO 4) 2 · 12 H 2 O. Product Number Product Description SDS; ... Aluminum potassium sulfate dodecahydrate. Synonyms: Alum, Potassium alum, Potassium aluminum sulfate dodecahydrate. CAS Number: . Molecular Weight: EC Number: . Linear Formula: AlK(SO 4) 2 · 12H 2 O. Product Number Product Description SDS; 237086:

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54 | CHM151LL LAB MANUAL K(aq) + + Al (aq) 3+ +2 SO 4 (aq) 2– +12 H 2O(l) → KAl(SO4)2 ⋅12H2O(l) SAFETY Potassium hydroxide is a strong base. Solutions of it, if splashed into the eye, can do irreparable damage so quickly that it is not possible to reach the eyewash fountain in time to prevent it.

It is an inorganic salt, also called potassium aluminum sulfate with a formula of AlK (SO4)2 that is predominantly produced in the dodecahydrate form (AlK (SO4)2 * 12H2O). Potassium alum is formed by large, transparent crystals that are used in different products .

Using the masses of each element of potassium aluminum sulfate dodecahydrate, we calculate the theoretical yield: Mass (KAl (SO 4 ¿ 2 • 12 H 2 O) = × 102 mol ( + + (+ × 4) × 2 + 12 × 18) mol ≈ grams Theoretical Yield = grams Experimental Yield = grams The formula below finds the percentage ...

Obtaining potassium alum K 2 SO 4 ·(Al 2 SO 4) 3 ·24H 2 O (ACC) based on the low solubility at low temperatures. ACC are colorless octahedral crystals with a density of g/cm 3. When the temperature of °C alum melt in the water of crystallization at 120°C to give 10 molecules of water at 200°C to form a porous mass of anhydrous alum.