This is another difficult topic in chemistry. Most students aren't able to think conceptually, which is what this topic is, but this website breaks it into almost a pattern that helps students understand it better
This is a good site for an upper level chemistry course...perhaps an AP chemistry or a college chemistry class. An honors chemistry class might be able to do this with guidance. I think this would be a good website for explorative learning by themselves or as supplement to the textbook
This is a good website to tie everything together after all things are taught about acids and bases. Oftentimes students need something to put each individual lesson together, and I think this website does this well and in a clear/concise manner
This is perhaps one of the most difficult topics for students to first grasp in chemistry. By using more resources and seeing it in a variety of ways, students will be able to understand the concept better