Final answer:
Using water that is too hot for brewing coffee causes the extraction to occur quickly, which can lead to a bitter taste due to over-extraction.
Step-by-step explanation:
Brewing coffee involves the process of extraction where compounds from the coffee grounds are dissolved in water to create a homogeneous mixture, also known as a solution. When water that is too hot is used for brewing coffee, extraction happens quickly. This rapid extraction can lead to over-extraction, where too many of the bitter compounds are pulled out, resulting in a beverage that can taste harsh or burnt.