Leave the text unchanged, do not delete or add anything, just correct typos, punctuation, and paragraphing! Use [English] and use Markdown for formatting. There are multiple ways to represent a precipitation reaction. We introduced precipitation reactions using the molecular equation, which represents ionic compounds dissolved in water using their formula unit. For example, we can represent the reaction between lead two nitrate and potassium chloride using this equation. Another way to represent the reaction is using the complete ionic equation, which shows strong electrolytes broken apart into their component ions. Soluble salts are strong electrolytes. So when lead two nitrate and potassium chloride are dissolved in water, they split apart into lead two plus, nitrate, potassium, and chloride ions. During the reaction, the lead two plus ions combine with the chloride ions to produce the precipitate. Since lead two chloride is an insoluble ionic compound, it is not a strong electrolyte, so it is not broken apart into ions in the complete ionic equation. The potassium and nitrate ions, however, remain in solution since potassium nitrate is a soluble ionic compound. A third way to represent the reaction is using the net ionic equation, which removes spectator ions. Spectator ions do not participate in the reaction, so they show up exactly the same on both sides of the complete ionic equation. Potassium and nitrate are spectator ions in this reaction, so they're removed to produce the net ionic equation, which is the reaction of lead two plus with chloride to produce lead two chloride. Let's practice; we'll start by writing the molecular equation for the reaction between aqueous potassium phosphate and aqueous calcium nitrate. When our ions switch partners, we produce calcium phosphate and potassium nitrate. According to our solubility rules, calcium phosphate is insoluble so it is our precipitate, but potassium nitrate is soluble so it remains in solution as aqueous. To balance this reaction we need coefficients of 2, 3, 1, and 6. Next, we can write the complete ionic equation by splitting apart any strong electrolytes. Potassium phosphate, calcium nitrate, and potassium nitrate are all soluble ionic compounds, so they're all strong electrolytes. They get broken apart into their component ions. Calcium phosphate is insoluble, so it remains together as a solid. To determine our coefficients in the complete ionic equation for the separated ions, we multiply the coefficient for the ionic compound by the number of ions in the compound. For example, there are two potassium phosphates and each has three potassium ions, so there are a total of six potassium ions. Likewise, there are three calcium nitrates and each has two nitrate ions, so there are a total of six nitrate ions. Lastly, we can write the net ionic equation by removing the spectator ions, which show up on both sides of the complete ionic equation. Our spectator ions are potassium and nitrate, so our net ionic equation is two phosphate ions combine with three calcium ions to produce solid calcium phosphate.