Acid-Base TheoryHESI A2 cheat sheet

Definitions and neutralization

8 key facts 5 practice questions Reviewed Oct 2026

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Definitions

Arrhenius — acids give H⁺, bases give OH⁻
Brønsted-Lowry — acids donate protons, bases accept them

Strong Vs Weak

Strong acids and bases dissociate completely (HCl, NaOH)
Weak ones only partly (acetic acid, ammonia)
Strength is not the same as concentration

Neutralization

Acid + base → salt + water
HCl + NaOH → NaCl + H₂O

Ph

pH = −log[H⁺]; lower pH means more H⁺

Key takeaway

Definitions and neutralization

Before you read

Test yourself first: 5 questions

Question 1 of 5

When an acid and a base react together, they produce:

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