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Updated: May 1, 2025
The selection of the best substance to be used as a standard for acid solutions has been the subject of much controversy. Chem. 2HNaCO > Na CO + H O + CO and without loss of any carbon dioxide from the sodium carbonate, such as may occur at higher temperatures. The process is carried out as described below.
This reacts with the oxalic acid, setting free carbonic acid, which, in turn, forms sodium bicarbonate with the remaining carbonate: H CO + Na CO > 2HNaCO . If, however, the solution is heated to boiling, the bicarbonate loses carbon dioxide and water, and reverts to sodium carbonate, which causes the indicator to become again pink: 2HNaCO > H O + CO + Na CO .
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