Stoichiometry in the Synthesis of Ionic Compound AP Chemistry

Many combinations of mono and trivalent cations yield crystals of the same stoichiometry and structure. The crystals are normally in the form of an octahedron. Sodium, potassium and ammonium ions are often the monovalent species whereas aluminum and chromium are examples of the trivalent ions. Potassium Alum, KAl(SO4)2.12H2O, is the most common and is used in water purification, paper manufacturing and as a mordant in dyeing. In this experiment we will perform a series of chemical reactions which lead to the synthesis of the ionic compound potassium alum.

Kit Includes:

• Aluminum Metal Powder UN1396 - 25 g x 2 Bottles
• Potassium Hydroxide, 3.0M Solution UN1814 - 250 ml x 2 Bottles
• Sulfuric Acid, 3M Solution UN2796 - 250 ml x 4 Bottles
• Ethanol/Water V/V 50/50% Solution UN1170 - 250 ml x 4 Bottles

• (# 6131-4) Beaker Glass 250 ml - 30 pcs
• (# 3351-3) Support Stand - 15 pcs
• (# 3419-3) Wire Gauze - 15 pcs
• (# 3017-5) Bunsen Burner - 15 pcs
• (# 3763-4) Buchner Funnels - 15 pcs
• Analytical Balance - 1 pc

DOT: UN1814, Potassium hydroxide, solution, 8, PG II, Ltd Qty
UN2796, Sulfuric acid, 8, PG II, Ltd Qty
UN1170, Ethanol, 3, PG III, Ltd Qty

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