acid-base indicator

Từ điển Oxford Learners Wordfinder Dictionary

noun

an indicator that changes color on going from acidic to basic solutions
• Hypernyms:
indicator
• Hyponyms:
phenolphthalein, congo red, methyl orange, litmus, litmus test,
bromophenol blue, bromphenol blue, tetrabromo-phenolsulfonephthalein, bromothymol blue, bromthymol blue