Chad provides a comprehensive lesson on the trends in acidity for binary acids, oxoacids, and polyprotic acids. Both size (down a group) and electronegativity (to the right across a period) play a role in the strength of binary acids, whereas resonance-stabilization and electronegativity play a role in the strength of oxoacids. This is demonstrated with the oxoacids of chlorine. Finally, poly protic acids are capable of donating multiple protons, but each successive proton dissociates to a decreasing extent being more weakly acidic. I've embedded this playlist as a course on my website with all the lessons organized by chapter in a collapsible menu and much of the content from the study guide included on the page. Check this lesson out at If you want all my study guides, quizzes, final exam reviews, and practice exams, check out my General Chemistry Master Course at 00:00 Lesson Introduction 00:28 Binary Acid Strength 06:44 Oxoacid Strength 14:03 Polyprotic Acid Strength