(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.
Nicholas II (1868-1918) Nicholas II, 1914 Â© Nicholas II was the last tsar of Russia. He was deposed during the Russian Revolution and executed by the Bolsheviks. Nikolai Aleksandrovich Romanov was born near St Petersburg on 18 May 1868, the eldest son of Tsar Alexander III. When he succeeded his father in 1894, he had very little experience of government. In the same year, Nicholas married Princess Alexandra of Hesse-Darmstadt (a duchy in Germany).