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Gay-Lussac concluded that acids and bases can be defined:
ABy their colour alone
BBy their density alone
CIn terms of each other
DBy their taste alone
Answer & Solution
Correct answer: C. In terms of each other
1. Early chemists sought a definition that did not depend on tasting a sample.
2. Joseph Louis Gay-Lussac concluded that acids are substances that can neutralise bases.
3. He also concluded that these two classes of substances can be defined only in terms of each other.
4. That relational view survives in the Bronsted-Lowry picture of conjugate pairs.
5. Density and colour vary widely within each class, so neither could serve.
_Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 14 'Acid-Base Equilibria', sections 14.1-14.7_
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