- published: 05 Jan 2016
- views: 4511
A bromide is a chemical compound containing a bromide ion, that is a bromine atom with an effective charge of −1. The class name can include ionic compounds such as caesium bromide or covalent compounds such as sulfur dibromide.
Bromide is present in typical seawater (35 PSU) with a concentration of around 65 mg/L, which is around 0.2% of all dissolved salts. Seafoods and deep sea plants generally have high levels of bromide, while foods derived from land have variable amounts.
One can test for a bromide ion by adding dilute nitric acid (HNO3), then silver nitrate (AgNO3). A creamy precipitate of silver bromide forms.
Bromide compounds, especially potassium bromide, were frequently used as sedatives in the 19th and early 20th century. Their use in over-the-counter sedatives and headache remedies (such as Bromo-Seltzer) in the United States extended to 1975, when these bromides were withdrawn as ingredients, due to chronic toxicity.
This use gave the word "bromide" its colloquial connotation of a boring cliché, a bit of conventional wisdom overused as a calming phrase, or verbal sedative.
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