A set of theoretical chemistry textbooks and problem sets for high school students. - Title: High School Chemistry: Theoretical Chemistry - Problem Set: Separate Volume Problem Set - Chapter: Chapter 3 - Content: Problems related to chemical ions - Publisher: Gakken I have underlined important parts and marked areas where I struggled. There are sticky notes attached in some places, so it's a little sticky. However, I think it's perfectly usable. Thank you for looking.