(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.
Ivan the IV, or Ivan the Terrible, was tsar of Russia from 1530-1584 and established a tradition of absolute rule. After a childhood of abuse and repression he destroyed his rivals and claimed the throne of Tsardom. He beat back the last of the Mongols, provided some large territotial expansion, and centralized the bureacracy.