Both the cation and anion must be named.Ģ. The basic rules for writing names of ionic compounds: 1. The numbers of each element present in the compound become subscripts in the chemical formula.Įxample 5: Write the formula for magnesium phosphate.įirst identify the cation and anion in this compound.Ĭation = magnesium = Mg +2 anion = phosphate = PO 4 -3įor a neutral compound, three Mg +2 are needed for every 2 PO 4 -3 The formula of the compound is Mg3(PO4)2 Total charge of all the positive cations must equal the total charge of all the negative anions in the compound. Combine the ions in a ratio that results in the formation of a neutral ionic compound.Determine the formulas and charges on the cation and anion involved in the compound.The basic rules for writing the chemical formulas of ionic compounds: Ionic compounds are formed when positive cations and negative anions are attracted to each Review: Chemical Formulas and Names of Ionic Compounds
Balance the equation (to ensure mass conservation).īe sure to include the physical states of all reactants and products in your final equation.
If you determine that a reaction will not occur, write “no reaction” after the arrow. If you determine that a reaction will occur, write the correct formula(s) of the products after the arrow.Identify the reaction type – precipitation, neutralization or gas forming.Write chemical formulas for each reactant and place a yield arrow (→ ) after the last reactant.
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