Phase 1: Determine the defining attributes of acids Acids possess distinct attributes that differentiate them from other substances. These include: - A tendency to change blue litmus paper to red. - A sour flavor profile. - A pH value below 7.
Phase 2: Select the accurate choice - Choice (1) "They turn blue litmus paper red" accurately describes an acid's characteristic. - Choice (2) "They turn red litmus paper blue" is characteristic of bases. - Choice (3) "They have a bitter taste" is also a property associated with bases. - Choice (4) "They are slippery to touch" is a characteristic of bases, not acids.
Conclusion: The correct choice is (1): They turn blue litmus paper red.