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Chemical structure of phenolphthalein, a common phthalein dye. Phthalein dyes are a class of dyes mainly used as pH indicators, due to their ability to change colors depending on pH. [1] They are formed by the reaction of phthalic anhydride with various phenols. They are a subclass of triarylmethane dyes. Common phthalein dyes include ...
The economy saw continuous real GDP growth of at least 5% since 2012. The Philippine Stock Exchange index ended 2012 with 5,812.73 points a 32.95% growth from the 4,371.96-finish in 2011. [80] The Philippines achieved an investment grade rating for the first time in the first quarter of 2013.
Philippines Free Press is founded by Judge W.A. Kincaid and publishes its first issue in magazine format. [45] [100] [clarification needed] 1909 March 6 Present-day University of the Philippines Los Baños in Laguna is established, first autonomous UP campus. [22]
Phenolphthalein (/ f ɛ ˈ n ɒ l (f) θ ə l iː n / [citation needed] feh-NOL(F)-thə-leen) is a chemical compound with the formula C 20 H 14 O 4 and is often written as "HIn", "HPh", "phph" or simply "Ph" in shorthand notation. Phenolphthalein is often used as an indicator in acid–base titrations.
Museum of Philippine Economic History (Hiligaynon: Museo sang Kasaysayan sang Ekonomiya sang Pilipinas; Filipino: Museo ng Kasaysayan ng Ekonomiya ng Pilipinas) is a museum in Iloilo City, Philippines. It is located on the historic street of Calle Real in Iloilo City Proper. [1]
History of transportation in the Philippines (2 C, 1 P) Pages in category "Economic history of the Philippines" The following 23 pages are in this category, out of 23 total.
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The history of the Philippines dates from the earliest hominin activity in the archipelago at least by 709,000 years ago. [1] Homo luzonensis, a species of archaic humans, was present on the island of Luzon [2] [3] at least by 134,000 years ago. [4] The earliest known anatomically modern human was from Tabon Caves in Palawan dating about 47,000 ...