(Concept 3.3) A buffer causes acidic solutions to become alkaline, and alkaline solutions to become acidic. A buffer stabilizes the pH of a solution by preventing acids or bases from dissociating. A buffer accepts hydrogen ions when they are in excess and donates hydrogen ions when they have been depleted.
Ivan IV, The Terrible, was crowned Russia's first Tsar at the age of 17. Ivan the Terrible was the fallen angel. He set up a bodyguard that has been described as Russia's first 'secret police' - the Oprichniki - as a religious brotherhood sworn to protecting God's Tsar.
Most renowned and the longest-ruling female leader of Russia, reigning from 1762 until her death in 1796 at the age of 67. She was born in Stettin, Pomerania, Prussia as Sophie Friederike Auguste von Anhalt-Zerbst-Dornburg, and came to power following a coup d'Ã©tat when her husband, Peter III, was assassinated.