| http://www.w3.org/ns/prov#value | - To neutralize the acid HHal formed in the reaction, an acid acceptor, for example sodium hydroxide solution or potassium hydroxide solution, sodium carbonate, sodium bicarbonate or potassium carbonate, is added in each reaction stage, gradually as the reaction progresses (decrease in pH) or all at once, in an amount such that the pH of the reaction mixtures is 6 to 9.
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