AP Chemistry Topic 8.4 Video 2 - Weak Acid-Base Reactions and Buffers

Struggling with net ionic equations for weak acid-base reactions? You're not alone — and this video will change that. Most students can memorize strong acid-base reactions, but the moment a weak acid or base shows up, things fall apart fast. In this video, Mr. Kasner breaks it all down visually using particle diagrams so you can actually see what's happening in solution — not just memorize steps blindly. Once you understand the particle-level behavior, those tricky AP exam questions start making a lot more sense. Stick around, because Mr. Kasner walks you through real AP-style example problems step by step, sharing the exact thought process you need to solve them confidently — including a breakdown of what will and won't be tested, so you're not wasting time on the wrong things. And if justification questions have ever cost you points on an exam, pay close attention — Mr. Kasner breaks down exactly how to structure your written responses so that your reasoning is clear, complete, and earns full credit every time. Whether you're prepping for the AP exam or just trying to survive your next test, make sure you watch until the end — the problem-solving walkthrough and justification tips alone are worth it. 00:00 Introduction 00:41 Strong acid behavior in solution 01:02 Weak acid behavior in solution 01:45 Combination of weak acid and strong base 04:27 Example - HF (weak acid) and a strong base particle diagram 06:51 Creating an ideal buffer from HF and a strong base 07:22 Question 1 – Weak acid and strong base 11:03 Question 2 – Weak base and strong acid 12:46 Example – NH3 (weak base) and strong acid particle diagram 13:29 Second method for creating a buffer 14:57 Outline of methods for creating a buffer 15:32 Question 3 – Creating an ideal buffer from a weak acid 19:13 Conclusion