Strong Acid Lab Demonstration pH Test Strips

SKU: 33812-0025

$9.59USD or lower Each

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Demonstrate extreme acidity safely using Indigo® pH 0–2.5 test strips. Ideal for chemistry labs, education, and safety training.

Strong acids play a foundational role in chemistry education, from acid-base theory to corrosion, dissociation, and chemical safety. Indigo® Acid pH 0-2.5 test strips provide a simple, visual way for students to observe extreme acidity without the need for meters, probes, or liquid reagents. Their rapid color change makes them well suited for demonstrations, guided experiments, and supervised lab activities involving highly acidic solutions.

We've been selling pH test strips since 2005. All Indigo® pH test strips have Certificate of Analysis, Stability & SDS documents as listed below. They come 50 strips/pack with a guaranteed 3 year shelf life (dated back from expiration date "yyyy.mm.dd").
Details Specs Docs Reviews
Details

Indigo® pH 0–2.5 test strips are intended for educational and demonstration use and provide qualitative confirmation of strong acidity. They can also test other acids at concentrations noted in mM. You can use any of these acids with test strips in a science project involving serial dilution using a dropper &/or graduated cylinder.

  • 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)

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

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.

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Specifications

Color chart pH 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 is approximate.
Documentation

A Certificate of Conformance is available on request after shipment.
Indigo® pH test strips are made in USA & calibrated with NIST standards.

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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