When preparing acidified sodium thiosulfate solution, the substances are added on this order: distilled water + hydrochloric acid + aqueous sodium thiosulfate.
Acids solutions are prepared when acid is dissolved in water.
£n preparing acid solutions, acid are added to water and not water to acids.
Therefore, in preparing acidified sodium thiosulfate solution, the order in which the substances are added to water is distilled water first, then hydrochloric acid and finally aqueous sodium thiosulfate.
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