Acid
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An acid is a chemical compound that donates hydrogen ions to a solution. This process increases the concentration of hydrogen ions in the solution, lowering its pH.
When a chemical loses (or donates) a hydrogen bond, it is behaving as an acid.To help with this remember the acronym BAADBases Accept, Acids Donate
A base donates hydroxide ions (OH-) into solution.
Acids contain hydrogen atoms that can ionize to release hydrogen ions (H+). The ability of these hydrogen ions to donate protons is what gives acids their chemical properties, such as their ability to react with bases to form water and salts. The strength of an acid is determined by how readily it donates these hydrogen ions.
Acids produce hydrogen ions as the only positive ions in aqueous solution. When an acid dissolves in water, it donates a hydrogen ion (H+) to the solution, resulting in the formation of hydrogen ions.
The ionic compound formed from barium and sulfide is barium sulfide, with the chemical formula BaS. In this compound, barium donates two electrons to sulfur to form a stable ionic bond.