Orthoacid is a binary compound composed of two elements. If a positively charged metal element has two valences, those elements with common valences are denoted by the prefix "positive" in the name, and the word "positive" can generally be omitted. Among simple oxyacid molecules, the more common one in the free state is called "(N) acid". Such as sulfuric acid, hydrochloric acid, nitric acid, etc.
Alkali refers to all alkalis (soluble and insoluble), such as calcium hydroxide, magnesium hydroxide, sodium hydroxide, potassium hydroxide, barium hydroxide, copper hydroxide and iron hydroxide.
Salts produced by the reaction of the above substances, such as sodium sulfate, calcium sulfate, copper sulfate, sodium nitrate, calcium nitrate, copper nitrate, sodium chloride, calcium chloride and copper chloride (soluble and insoluble) are all normal salts.
Corresponding to normal salt are acid salt and basic salt, and besides metal and nonmetal ions, there are H+ or OH-, such as acid salt: baking soda NaHCO3, and basic salt:
Basic copper carbonate CU(OH)2CO3
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