sodium hydrogen sulfate, also known as bisulfate of soda or sodium acid sulfate, is a dry mineral acid that is commonly used to lower the pH of liquids. It can be found in a number of products, including toilet bowl cleaners, detergents, and dishwasher cleaning products.
Unlike other acids, sodium bisulfate is very stable in its dry form and will not dissolve in water (hygroscopic). When mixed with a liquid, it lowers the pH of the liquid.
It can be used to control the pH of many types of water and is often incorporated in swimming pool products. It is also an additive in a variety of foods, including baked goods and fresh-cut fruits, as it reduces browning caused by sun exposure.
This chemical is corrosive to metals and can damage soft tissue, but it is not carcinogenic in large doses. It is generally considered safe for food use and meets the requirements of the FDA.
sodium hydrogen sulfate, purified is used in metal finishing, cleaning products and to lower the pH of water for effective chlorination. It is also used as a urine acidifier to reduce urinary stones in cats. It is also an ingredient in jewelry making and a component of anti-browning products applied to fresh-cut fruits.