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The rate and outcome of chemical reactions taking place in water often depends on the acidity of the water, and it is therefore useful to know the acidity of the water, typically measured by means of a pH meter. [5] Knowledge of pH is useful or critical in many situations, including chemical laboratory analyses. pH meters are used for soil ...
A pH indicator is a halochromic chemical compound added in small amounts to a solution so the pH (acidity or basicity) of the solution can be determined visually or spectroscopically by changes in absorption and/or emission properties. [1] Hence, a pH indicator is a chemical detector for hydronium ions (H 3 O +) or hydrogen ions (H +) in the ...
The measurement of pH can become difficult at extremely acidic or alkaline conditions, such as below pH 2.5 (ca. 0.003 mol/dm 3 acid) or above pH 10.5 (above ca. 0.0003 mol/dm 3 alkaline). This is due to the breakdown of the Nernst equation in such conditions when using a glass electrode.
Originally, many thước of varying lengths were in use in Vietnam, each used for different purposes. According to Hoàng Phê (1988), [1] the traditional system of units had at least two thước of different lengths before 1890, [2] the thước ta (lit. "our ruler") or thước mộc ("wooden ruler"), equal to 0.425 metres (1 ft 4.7 in), and the thước đo vải ("ruler for measuring ...
The Vietnamese Wikipedia initially went online in November 2002, with a front page and an article about the Internet Society.The project received little attention and did not begin to receive significant contributions until it was "restarted" in October 2003 [3] and the newer, Unicode-capable MediaWiki software was installed soon after.
The per capita production of cereals in the district was 434.1 kilograms (957 lb) as against the national figure of 501.8 kg in 2007. [21] In 2007, the industrial output of the province was a meagre 1102.7 billion đồngs against the national output of 1.47 million billion dongs.
These are Lang Son, Son La, Hoa Binh, Bac Ninh and Hai Duong in the North, Vinh in the Centre, as well as Tra Vinh, Soc Trang and Can Tho in the Mekong Delta. In 2010 the province of Soc Trang has been the first to enact a sewer tariff that is designed to recover the costs of operation and maintenance. In 2012 Bac Ninh introduced a sewer tariff ...
Nguyễn Đình Chiểu was born in the southern province of Gia Định, the location of modern Saigon.He was of gentry parentage; his father was a native of Thừa Thiên–Huế, near Huế; but, during his service to the imperial government of Emperor Gia Long, he was posted south to serve under Lê Văn Duyệt, the governor of the south.
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