Biết sự khác biệt giữa phân tử và hợp chất ion. Nhận biết độ tan của hợp chất. Xác định cation và anion trong hợp chất. Nhận biết các ion đa nguyên tử trong phản ứng.

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The first step in writing a net ionic equation is identifying the ionic compounds of the reaction. Ionic compounds are those that will ionize in an aqueous solution and have a charge. Molecular compounds are compounds that never have a charge. They are made between two non-metals and are sometimes referred to as covalent compounds.  Ionic compounds can be between metals and nonmetals, metals and polyatomic ions, or multiple polyatomic ions. If you are unsure of a compound, look up the elements of the compound on the periodic table.  Net ionic equations apply to reactions involving strong electrolytes in water. Not all ionic compounds are soluble in an aqueous solution and therefore, will not dissociate into individual ions. You must identify the solubility of each compound before proceeding with the rest of the equation. Below is a brief summary of the rules of solubility. Seek out a solubility chart for more details and exceptions to these rules.  Follow these rules in the order stated below: All Na+, K+, and NH4+ salts are soluble. All NO3-, C2H3O2-, ClO3-, and ClO4- salts are soluble. All Ag+, Pb2+, and Hg22+ salts are insoluble. All Cl-, Br-, and I- salts are soluble. All CO32-, O2-, S2-, OH-, PO43-, CrO42-, Cr2O72-, and SO32- salts are insoluble (with some exceptions). All SO42- salts are soluble (with some exceptions). Cations are the positive ions in a compound and are generally the metals. Anions are the negative, non-metal ions in the compound. Some non-metals are capable of forming cations, but metals will always form cations. For example, in NaCl, Na is the positively charged cation because it is a metal while Cl is the negatively charged anion because it is a non-metal. Polyatomic ions are charged molecules that are bound so tightly together that they do not dissociate during chemical reactions. It is important to recognize polyatomic ions as they have a specific charge and do not break down into their individual components. Polyatomic ions can be both positively and negatively charged.  If you...