Describe the electrolysis of an aqueous solution of KNO3

th th Chapter 7 from “Introductory Chemistry” by Zumdahl and Decoste, 7 /8 edition *Majority of the chemical reactions that take place in our bodies occur in aqueous solutions Ex: oxygen dissolving into blood stream Pg 137. PREDICTING IF A REACTION WILL HAPPEN Driving Force: “changes that make reactions go in the direction of the arrow,” the cause of the product Most common driving forces: 1. Forms a solid 2. Forms of water 3. Transfers electrons 4. Forms a gas -if two or more chemicals are joined together and any of these happened, there most likely is a chemical reaction REACTION: SOLID FORMS Precipitation: process by which a solid is formed Precipitate: the solid formed Precipitation Reaction: the reaction itself Ionic Compounds in Aqueous Solutions *In majority of “solid containing ions dissolved in water, the ions separate and move around independently” -if electricity is conducted, then there are separated ions in the chemical (ex: pure water does not have separate ions, therefore, pure water does not conduct electricity) Strong Electrolyte: substance of which each unit in an aqueous solutions produces separate ions (Ex: Barium Nitrate= Ba(NO ) , s3 2rates into ions: Ba , NO , NO ) 3 3- In a mixed solution, though the equation can be written as Formula + Formula  Products, it’s more appropriate to write it as Formula separated into ions + Formula separated into ions  Products Ex: K2CrO 4aq) + Ba(NO ) (3 2