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Meta-phosphoric acid, also known as polyphosphoric acid, is a powerful and versatile chemical compound with a wide range of effects and uses. It is a clear, colorless, viscous liquid that is highly hygroscopic and soluble in water. Meta-phosphoric acid is a derivative of phosphoric acid, and it is formed by the dehydration of phosphoric acid.

One of the key effects of meta-phosphoric acid is its ability to act as a dehydrating agent. It is commonly used in organic synthesis as a catalyst and dehydrating agent to remove water from reaction mixtures. This property makes it an important reagent in the production of various organic compounds, such as esters, amides, and anhydrides.

Meta-phosphoric acid also has strong acidic properties, and it is commonly used in the food industry as a food additive and preservative. It is used to acidify and preserve food products, such as jams, jellies, and canned fruits, by inhibiting the growth of bacteria and mold. It is also used as a flavor enhancer and stabilizer in certain food products.

In addition to its use in organic synthesis and the food industry, meta-phosphoric acid is also used in the production of detergents and cleaning products. It is used as a chelating agent to remove metal ions from hard water, which helps to improve the effectiveness of cleaning agents. It is also used as a pH adjuster and buffering agent in various cleaning formulations.

Furthermore, meta-phosphoric acid has applications in the pharmaceutical industry, where it is used as a reagent in the synthesis of pharmaceutical drugs and as a stabilizer in certain drug formulations.

Overall, meta-phosphoric acid is a highly versatile chemical compound with a wide range of effects and uses. Its dehydrating, acidic, and preservative properties make it an important reagent in various industries, including organic synthesis, food production, cleaning products, and pharmaceuticals.