Its pH changes very little when a small or moderate amount of strong acid or base is added to it and thus it is used to prevent changes in the pH of a solution. Buffer solutions are used as a means of keeping pH at a nearly constant value in a wide variety of chemical applications.
The Wizard of Oz movie musical premieres in Oconomowoc, Wisconsin. The Wizard of Oz, starring Judy Garland and featuring words and music by E.Y. âYipâ Harburg and Harold Arlen, receives its world premiere in Oconomowoc, Wisconsin, on this day in 1939.
Emerald City. For other uses, see Emerald City (disambiguation). The Emerald City (sometimes called the City of Emeralds) is the capital city of the fictional Land of Oz in L. Frank Baum's Oz books, first described in The Wonderful Wizard of Oz (1900).