content: A buffer is a solution that can resist pH changes when an acid or base is added. It is typically made of a weak acid and its conjugate base, or a weak base and its conjugate acid. Buffers are important in maintaining stable pH levels in various chemical and biological contexts, such as in blood where it helps maintain a pH of approximately 7.4.
response: Why is the pH of YouTube very stable? Because it constantly buffers. (Image: A confused student looking at a buffering video on YouTube, with test tubes and pH paper in the background.)