# 4: Introduction to acids and bases

- Page ID
- 208992

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- 4.1: Brønsted-Lowry Acids and Bases
- A Brønsted-Lowry acid is a proton donor; a Brønsted-Lowry base is a proton acceptor. Acid-base reactions include two sets of conjugate acid-base pairs.

- 4.2: The pH Scale
- pH is a logarithmic function of [H+]. [H+] can be calculated directly from pH. pOH is related to pH and can be easily calculated from pH.