litmus paper
pH testing strip
Litmus paper is paper treated with a dye that changes color in response to acids and bases—turning red in acidic solutions, blue in alkaline ones.
It provides a quick, simple chemical test.
The figurative litmus test is any single factor that decisively reveals someone's position or character: Abortion has become a litmus test for Supreme Court nominees.
Sign revealing status
- color changeAlteration of hue
- pH testAcidity measurement method
- dipBrief immersion or condiment
- wetSaturated with liquid
dye · absorbent · reaction · colorimetric · spot test · field test · diagnostic · sample
Standard for comparison
- criterionStandard for judgment
- standardLevel of quality accepted
- measureUnit of quantity
- gaugeStandard of measurement
barometer · indicator · acid test · pass-fail · threshold · judgment · evaluation · single-issue
Primary color; also sad
- baseSupporting bottom structure
- hydroxideAlkaline oxygen-hydrogen compound
- ammoniaAcrid nitrogen-hydrogen gas
- limewaterDissolved calcium hydroxide
bleach · baking soda · bicarbonate · sodium hydroxide · potassium hydroxide · magnesium hydroxide · calcium carbonate · washing soda
Study of substances' interactions
- experimentSystematic investigation procedure
- beakerLaboratory measuring container
- test tubeNarrow cylindrical lab vessel
- titrationMeasuring concentration by addition
bench · chemist · analytical · measurement · glassware · pipette · dropper · reagent
Primary color, warm
- vinegarAcidic cooking liquid
- lemon juicePressed citrus liquid
- citrusAcidic fruits with segments
- sourSharp, biting taste
low pH · battery acid · gastric acid · acetic acid · citric acid · hydrochloric acid · sulfuric acid · carbonic acid
indicator
Sign revealing status
- color changeAlteration of hue
- pH testAcidity measurement method
- dipBrief immersion or condiment
wet · dye · absorbent · reaction · colorimetric · spot test · field test · diagnostic · sample · solution
benchmark
Standard for comparison
gauge · barometer · indicator · acid test · pass-fail · threshold · judgment · evaluation · single-issue · make-or-break
blue
Primary color; also sad
- baseSupporting bottom structure
- hydroxideAlkaline oxygen-hydrogen compound
- ammoniaAcrid nitrogen-hydrogen gas
limewater · bleach · baking soda · bicarbonate · sodium hydroxide · potassium hydroxide · magnesium hydroxide · calcium carbonate · washing soda · borax
chemistry
Study of substances' interactions
- experimentSystematic investigation procedure
- beakerLaboratory measuring container
- test tubeNarrow cylindrical lab vessel
titration · bench · chemist · analytical · measurement · glassware · pipette · dropper · reagent · safety goggles
red
Primary color, warm
- vinegarAcidic cooking liquid
- lemon juicePressed citrus liquid
- citrusAcidic fruits with segments
sour · low pH · battery acid · gastric acid · acetic acid · citric acid · hydrochloric acid · sulfuric acid · carbonic acid · lactic acid
- chemistry labbeaker, flask, test tube, pipette, burner
- laboratorybeaker, test tube, flask, microscope, pipette
- science kittest tubes, beakers, safety goggles, chemicals, experiments
- Chemistry Suppliestest tubes, beakers, flasks, pipettes, graduated cylinders
- lab suppliesbeakers, beaker, test tubes, test tube, pipettes
- color changerschameleon, mood ring, thermochromic, octopus, cuttlefish
litmus paperthermometer
Heat-measuring instrument
barometer · hygrometer · voltmeter · spectrometer · Geiger counter