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For example, according to Chads, if it's an acid that starts at a higher pH and goes to basic it is a weak acid titrated with a strong base. Would this be the usual case? I had a question on a practice test that had a titration graph starting at a very low pH but the answer ended up being H2SO3 (a weak acid). Does the Chad rule of thumb only work if it's asking if an unknown is titrating an unknown? Since some weak acids can have very low pH if in high concentration right?