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Three small caps each contain water with a different solute. Cap 1: lemon juice (acid). Cap 2: caustic soda (base). Cap 3: sugar. Which solution(s) will conduct electricity?
AOnly sugar
BAll three equally well
COnly lemon juice
DLemon juice and caustic soda (acid and base), but NOT sugar
Answer & Solution
Correct answer: D. Lemon juice and caustic soda (acid and base), but NOT sugar
Solutions conduct because they contain free ions. Acids (lemon juice) and bases (caustic soda) dissociate into ions in water and conduct well. Sugar dissolves but stays as neutral molecules — no ions, no current. (Activity 11.5 demonstrates exactly this.)
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