Manganic acid, also known as permanganic acid, is a chemical compound with the formula HMnO4. It is a strong oxidizing agent and is often used in analytical chemistry. However, there are several synonyms for manganic acid, which can be confusing for those who are new to the subject. Some of the most common synonyms for manganic acid include potassium permanganate, permanganic acid potassium salt, manganese heptoxide, and manganese heptaoxidane. These synonyms are often used interchangeably, but it is important to understand that they all refer to the same chemical compound - manganic acid.