Acid pH 0-2.5 Test Strips, 50/Pack

SKU: 33812-0025

$7.95USD or lower Each

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Use Indigo® pH 0-2.5 test strips on your concentrated acid solutions. These lower pH strips work with concentrated sulfuric acid (H2SO4 ), hydrochloric acid (HCl, aka muriatic acid), nitric acid & other strong acids. Ideal for testing car battery acid. Only $7.95/50 test strips; Buy 3 packs and we're cheaper than "free" shipping!

Concentrated hydrochloric acid is present in your stomach. It aids in digestion but is also responsible for the burning sensation of acid reflux.


This strip can also test other acids when concentrated as noted by the amount in mM. You can use this in a science project as a serial dilution exercise using a dropper & graduated cylinder. Warning: These acids are highly corrosive when concentrated. Experiment only with the supervision of a teacher. Wear safety goggles & shield, lab coat & apron, proper gloves & in a fume hood if possible. Add acid to water not the other way around.

You can also view the structure of these acids with our 3D Molecular Model Builder. It doesn't always recognize chemical formulas but will display correctly if the chemical compound names are used.

  • HCl (10mM)
  • Chromic acid H2CrO3 (10mM)
  • Citric acid C6H8O7 100mM)
  • Isocyanic acid, HOCN (100mM)
  • Formic acid (methanoic acid), CH2O2 (100mM)
  • Lactic acid, (milk acid) C3H6O3 (100mM)
The minimum concentration needed for these strips to react is given in milliMoles. If you want to do a wider range of dilutions with these or weaker acids, use our pH 0-7 acid test strips.

See also medicine droppers & graduated cylinders for glassware you can use to accurately measure acids.


Color chart intervals: 0, 0.5, 1.0, 1.5, 2.0, 2.5,
  • Intervals of 0.5 pH unit but can resolve 0.25 with practice
  • Dip strip, shake off excess liquid, compare to color chart immediately
  • Minimum shelf life is 3 years if kept sealed but 5 years is typical
  • Store at room temperature away from sunlight.
  • The number of strips (50) per pack or vial is approximate.

Test Strip Documentation

Stability Statement Certificate of Analysis SDS
Indigo pH paper 3-6 acid 0.5 pH intervals Stability Statement Indigo pH paper 3-6 acid 0.5 pH intervals Certificate of Analysis Indigo pH paper 3-6 acid 0.5 pH intervals SDS
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