Detailed Instructions: Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.
Q: Question: What large carboxylic acid with three ionizable hydrogen atoms gives some fruits a sour or tart flavor? Answer: citric acid
A:
Citric acid is a large carboxylic acid with three ionizable hydrogen atoms. It is found in citrus fruits and gives them their sour or tart flavor.