Water, pH, and the Chemistry of Cells
Why Water Matters
Water as a Biological Solvent
Water is the main environment for life. Because it is polar, water helps dissolve many substances and supports the chemical reactions that cells need.
pH Basics
pH is a measure of acidity. A low pH means more acidic, a high pH means more basic, and pH around 7 is neutral. Many biological molecules only work properly within a narrow pH range.
Key Idea
Even small changes in pH can change the shape and function of proteins.
Water and pH Terms
Why is water so important in cells?
Water dissolves many molecules and provides the environment for biochemical reactions.
Correct answer: It acts as a solvent and supports reactions
What does pH measure?
pH tells us whether a solution is acidic, neutral, or basic.
Correct answer: How acidic or basic a solution is.
What often happens to proteins when pH changes too much?
Protein shape is sensitive to the chemical environment, including pH.
Correct answer: They may change shape and stop working properly