Solutions are used in practically every lab, for a broad range of processes.  Lab Procurement Services carries an extensive collection of products to handle our customers' diverse requirements, including various titrimetric and other wet methods.  Please be sure to visit our pH Buffers category for all of your electrochemistry calibration needs, and our Beakers and Flasks collections to view our offerings of those essential items.

For pH buffers, check the pH value and the temperature it is stated at (most here are specified at 25 °C), the tolerance, and whether the lot is traceable to a reference standard if your quality system requires it. Color-coded buffers, such as red for pH 4, yellow for pH 7 and blue for pH 10, help avoid mix-ups during calibration. Sizes run from 500 mL bottles to 4 L bottles and 10 L and 20 L Cubitainers, so buy a size you will use before the expiration date. Electrode storage solution, offered in several sizes, keeps pH electrodes ready between uses.

Buffers and Solutions: common questions

What is 1,10-phenanthroline used for?

1,10-Phenanthroline is an organic compound that forms an intensely colored orange-red complex with ferrous iron, which is the basis of a common colorimetric method for measuring iron in water and other samples. The iron complex, known as ferroin, is also used as a redox indicator in titrations. It is sold as the monohydrate or anhydrous form, so check which one your method calls for.

How long do pH buffer solutions last once opened?

An unopened buffer is good until the manufacturer's expiration date. Once opened, buffers can change as they absorb carbon dioxide from the air or become contaminated, and alkaline buffers such as pH 10 are affected most. Pour what you need into a clean container, never return used buffer to the bottle, keep it capped, and replace it if calibration results drift.

What is the difference between a buffer and a reagent?

A buffer is a solution that resists changes in pH when small amounts of acid or base are added, usually a weak acid or base mixed with its salt. A reagent is any substance used to cause or measure a chemical reaction. Buffers are a kind of reagent used to hold pH steady in analyses, biological work and instrument calibration.

Buffers and Solutions

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  1. Hydrochloric Acid Tech 20°Be, 20.00 L Winpak blue
    Manufacturer: Reagents Inc
    Hydrochloric Acid Tech 20°Be, 20.00 L Winpak blue (1 per EA )
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    was $285.00 Special Price $213.84
  2. Lead Perchlorate, 0.1 M, 1.00 L Glass amber
    Manufacturer: Reagents Inc
    Lead Perchlorate, 0.1 M, 1.00 L Glass amber (1 per EA )
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    was $169.00 Special Price $126.36
  3. Citric Acid, 10% w/v, 4.00 L Poly natural
    Manufacturer: Reagents Inc
    Citric Acid, 10% w/v, 4.00 L Poly natural (1 per EA )
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    was $201.00 Special Price $151.20
  4. Sod Tetraphenylboron, 0.005M U, 1.00 L Glass amber
    Manufacturer: Reagents Inc
    Sod Tetraphenylboron, 0.005M U, 1.00 L Glass amber (1 per EA )
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    was $96.00 Special Price $72.36
  5. Cyclohexylamine, 0.50 N /MeOH, 1.00 L Glass amber
    Manufacturer: Reagents Inc
    Cyclohexylamine, 0.50 N /MeOH, 1.00 L Glass amber (1 per EA )
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    was $217.00 Special Price $163.08
  6. Hydrochloric Acid, 12.5% v/v, 10.00 L Cubitainer
    Manufacturer: Reagents Inc
    Hydrochloric Acid, 12.5% v/v, 10.00 L Cubitainer (1 per EA )
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    was $208.00 Special Price $155.52
  7. Ferric Chloride, 20% w/w, 1.00 L Poly natural
    Manufacturer: Reagents Inc
    Ferric Chloride, 20% w/w, 1.00 L Poly natural (1 per EA )
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    was $198.00 Special Price $149.04
  8. Sodium Chromate, 2% w/v, 10.00 mL Glass amber
    Manufacturer: Reagents Inc
    Sodium Chromate, 2% w/v, 10.00 mL Glass amber (1 per EA )
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    was $50.00 Special Price $37.80
  9. Kit Oil #12, 1.00 L Glass amber
    Manufacturer: Reagents Inc
    Kit Oil #12, 1.00 L Glass amber (1 per EA )
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    was $75.00 Special Price $56.16
  10. Pot Acid Phthalate, 0.05 N, 500.00 mL Poly natural
    Manufacturer: Reagents Inc
    Pot Acid Phthalate, 0.05 N, 500.00 mL Poly natural (1 per EA )
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    was $72.00 Special Price $54.00
  11. Ammonium Thiocyanate, 10% w/v, 4.00 L Glass amber
    Manufacturer: Reagents Inc
    Ammonium Thiocyanate, 10% w/v, 4.00 L Glass amber (1 per EA )
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    was $280.00 Special Price $209.52
  12. Mercuric Acetate TS - 100mL
    Manufacturer: Dawn Scientific
    Mercuric Acetate TS - 100mL (1 per EA )
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    was $109.62 Special Price $106.88
  13. Sodium Chloride TS, Alkaline - 100mL
    Manufacturer: Dawn Scientific
    Sodium Chloride TS, Alkaline - 100mL (1 per EA )
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    was $29.62 Special Price $28.88
  14. Acid Ferrous Sulfate TS - 500mL
    Manufacturer: Dawn Scientific
    Acid Ferrous Sulfate TS - 500mL (1 per EA )
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    was $79.62 Special Price $77.63
  15. Potassium EDTA 0.076M, 1.00 L Poly natural
    Manufacturer: Reagents Inc
    Potassium EDTA 0.076M, 1.00 L Poly natural (1 per EA )
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    was $50.00 Special Price $37.80
  16. Polyquaternium-6, 35 Percent Aqueous Solution, Very low molecular weight, 250mL, CAS# 26062-79-3
    Manufacturer: Spectrum Chemical
    Polyquaternium-6, 35 Percent Aqueous Solution, Very low molecular weight is used as a cosmetic antistatic and conditioning agent. Ungraded products supplied by Spectrum are indicative of a grade suitable for general industrial use or research purposes and typically are not suitable for human consumption or therapeutic use.

    (1 per EA)
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    $193.60
  17. Phenol Red TS, (U.S.P. Test Solution), 100mL, CAS# 143-74-8
    Manufacturer: Spectrum Chemical
    Phenol Red TS, (U.S.P. Test Solution) is a ready-for-use solution for the purpose of conducting USP, National Formulary and assay tests and is prepared according to the specifications of the USP Pharmacopeial Convention.

    (1 per EA )
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    was $268.35 Special Price $258.07
  18. Potassium Hydroxide, 10 Percent (w/v), Solution, 20L, CAS# 1310-58-3
    Manufacturer: Spectrum Chemical
    Potassium Hydroxide, 10 Percent (w/v), Solution - Ungraded products supplied by Spectrum are indicative of a grade suitable for general industrial use or research purposes and typically are not suitable for human consumption or therapeutic use.

    (1 per EA )
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    was $742.10 Special Price $603.84
  19. Ammonium Hydroxide, SVS Concentrate, To Prepare 0.1 N Solution, 1UNIT, CAS# 1336-21-6
    Manufacturer: Spectrum Chemical
    Ammonium Hydroxide, SVS Concentrate, To Prepare 0.1 N Solution, is a solution of ammonia in water. Aqueous ammonia, as it's otherwise known is used as a complexant and base in qualitative inorganic analysis. It becomes a deep blue color with copper solutions. Used to dissolve silver oxide residues, such as the ones formed from Tollens' reagent, it is also commonly used in numerous cleaning agents, such as window cleaning formulas as well as a complexant that is manufactured to parts-per-billion trace impurities and has been used in the semiconductor industry to dissolve heavy or precious metal components.

    (6 per CS )
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    $900.90
  20. Magnesium Chloride, 51 Percent (w/v) Aqueous Solution, For Cyanide, APHA, 500mL, CAS# 25155-18-4
    Manufacturer: Spectrum Chemical
    Magnesium Chloride, 51 Percent (w/v) Aqueous Solution, For Cyanide, APHA, is a typical ionic halide that serves as a precursor to other magnesium compounds. Spectrum solutions utilize the highest quality raw materials appropriate to your product. Most raw materials meet or exceed the specifications established by the American Chemical Society. Where appropriate, many finished products are traceable to NIST Standard Reference Materials. Manufacturing, quality control testing, and packaging are all performed in Spectrum’s own facilities. Record keeping and sample retention of all produced lots ensure product consistency and complete traceability.

    (1 per EA )
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    was $497.80 Special Price $410.02
  21. Sodium Hypochlorite 5% ACS - ACS, 500mL, CAS#7681-52-9
    Manufacturer: Dawn Scientific
    Sodium Hypochlorite 5% ACS - ACS, 500mL, CAS#7681-52-9 (1 per EA )
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    was $47.62 Special Price $46.43
  22. Lactic Acid, 10% v/v, 500.00 mL Poly natural
    Manufacturer: Reagents Inc
    Lactic Acid, 10% v/v, 500.00 mL Poly natural (1 per EA )
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    was $52.00 Special Price $38.88
  23. Reagent 2 (Buffer), 10.00 L Cubitainer
    Manufacturer: Reagents Inc
    Reagent 2 (Buffer), 10.00 L Cubitainer (1 per EA )
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    was $493.00 Special Price $369.36
  24. Buffer, pH 13.00, 4.00 L Cubitainer
    Manufacturer: Reagents Inc
    Buffer, pH 13.00, 4.00 L Cubitainer (1 per EA )
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    was $100.00 Special Price $74.52
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