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Hence, a pH indicator is a chemical detector for hydronium ions (H 3 O +) or hydrogen ions (H +) in the Arrhenius model. Normally, the indicator causes the color of the solution to change depending on the pH. Indicators can also show change in other physical properties; for example, olfactory indicators show change in their odor.
In chemistry, Le Chatelier's principle (pronounced UK: / l ə ʃ æ ˈ t ɛ l j eɪ / or US: / ˈ ʃ ɑː t əl j eɪ /) [1] is a principle used to predict the effect of a change in conditions on chemical equilibrium. [2] Other names include Chatelier's principle, Braun–Le Chatelier principle, Le Chatelier–Braun principle or the equilibrium ...
A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another. [1] When chemical reactions occur, the atoms are rearranged and the reaction is accompanied by an energy change as new products are generated.
The overall chemical equation for neutralization of an aqueous solution of NaOH and carbonic acid is given by: 2 NaOH (aq) + CO 2(g) ⇌ Na 2 CO 3(aq) + H 2 O (l) [6] The color of the solution arises due to the pH indicator. The color of the ammonia-and-water solution at the beginning of the experiment indicates that the solution is alkaline.
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It is advised to check the references for photos of reaction results. [1] Reagent testers might show the colour of the desired substance while not showing a different colour for a more dangerous additive. [2]
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The development of molecular chemosensors as probes for such analytes is an annual multibillion-dollar business involving both small SMEs as well as large pharmaceutical and chemical companies. Left: Example of the change observed in the colorimetric azobenzene based chemosensor 1 in pH 7.4 solution upon recognition of copper ion. The ...
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