alleryStart learning →What did Robert Boyle observe acids do to certain natural dyes?
AThey changed the colour of the dyes
BThey dissolved the dyes completely
CThey made the dyes glow in the dark
DThey set the dyes permanently fast
Answer & Solution
Correct answer: A. They changed the colour of the dyes
1. Boyle characterised acids by what they visibly did, back in 1680.
2. He noted that they dissolve many substances and change the colour of natural dyes.
3. His stated example is litmus turning from blue to red.
4. He also saw they lose these properties after meeting an alkali.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 14 "Acid-Base Equilibria", section 14.1 Brønsted-Lowry Acids and Bases_
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