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. Silver Nitrate Reagent (25 mL sample, 1 drop = 10 ppm Clˉ), 16 oz
    Manufacturer: Taylor Technologies
    Silver Nitrate Reagent (25 mL sample, 1 drop = 10 ppm Clˉ), 16 oz (1 per EA)
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    was $115.76 Special Price $88.43
  2. Stacking Buffer 4X Solution, 500 Milliliters CAS# 1185-53-1, 151-21-3, 7732-18-5
    Manufacturer: Research Products International
    Formulation:???????? TRIS HCI: 0.5 M???????? SDS:?0.4%???????? pH:?6.8 Dimensions: 2.75 x 6.75 x 2.75, Weight: 0.27, Cas#: 1185-53-1, 151-21-3, 7732-18-5 Research or further manufacturing use only, not for food or drug use. (1 per EA)
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    $56.75
  3. Vario Rochelle Salt Solution 500 ML, Ea/1
    Manufacturer: Lovibond Tintometer Group
    Direct Replacement for Hach P/N 172549. Lovibond VARIO Rochelle Salt Solution, 500 ml The fast and easy use of VARIO Powder Packs has made them extremely popular for water testing applications in many countries throughout the world. The Lovibond Powder (1 per EA)
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    $102.70
  4. Oxalic Acid 7.5% W/V, 500ML, Poly Bottle
    Manufacturer: LabChem
    Shelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)
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    was $58.00 Special Price $43.50
  5. Sodium Hypochlorite, 5 Percent Available Chlorine, Solution, Reagent, ACS, 200L, CAS# 7681-52-9
    Manufacturer: Spectrum Chemical
    Sodium Hypochlorite, 5 Percent Available Chlorine, Solution, Reagent, ACS is a chemical compound otherwise known as bleach. Sodium hypochlorite solutions are used for their disinfection, deodorizing and stain removal properties. As an ACS grade Reagent, Spectrum Chemical manufactured Sodium Hypochlorite is used as the quality standard against which other substances are graded and has met the toughest regulatory standards for quality and purity.

    (1 per EA )
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    $2,250.75
  6. Isopropanol, 20% v/v, 1.00 L Poly natural
    Manufacturer: Reagents Inc
    Isopropanol, 20% v/v, 1.00 L Poly natural (1 per EA )
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    was $81.00 Special Price $60.48
  7. Hydrochloric Acid, 31.5% w/w, 2.50 L Glass clear
    Manufacturer: Reagents Inc
    Hydrochloric Acid, 31.5% w/w, 2.50 L Glass clear (1 per EA )
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    was $117.00 Special Price $87.48
  8. EDTA Titrant, 0.01 M, 500.00 mL Poly natural
    Manufacturer: Reagents Inc
    EDTA Titrant, 0.01 M, 500.00 mL Poly natural (1 per EA )
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    was $33.50 Special Price $24.84
  9. Acetate Buffer pH 4.6-4.7, For Bromide, 1L, Poly Bottle
    Manufacturer: LabChem
    Shelf Life (months): 36, Traceable to NIST, UN Number: (1 per EA)
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    was $84.70 Special Price $63.53
  10. Sodium Hydroxide, 50 Percent (w/v) Solution, 500mL, CAS# 1310-73-2
    Manufacturer: Spectrum Chemical
    Sodium Hydroxide, 50 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 $63.80 Special Price $51.92
  11. Trichloroacetic Acid, 30 Percent (w/v) Aqueous Solution, 1L, CAS# 1829-00-1
    Manufacturer: Spectrum Chemical
    Trichloroacetic Acid, 30 Percent (w/v) Aqueous Solution and other TCA solutions are used, depending upon grade and purity, in biochemistry to help the precipitation of macromolecules, cosmetics, topical medication preparations and in the production of pesticides. 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 $277.45 Special Price $225.76
  12. Hydrogen Peroxide, 35% w/w, 200.00 L Drum
    Manufacturer: Reagents Inc
    Hydrogen Peroxide, 35% w/w, 200.00 L Drum (1 per EA )
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    was $2,490.00 Special Price $1,867.32
  13. Silver-Ammonia-Nitrate TS - 100mL
    Manufacturer: Dawn Scientific
    Silver-Ammonia-Nitrate TS - 100mL (1 per EA )
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    was $59.62 Special Price $58.13
  14. pH 4.00 Calibration Buffer Solution 8 oz
    Manufacturer: Apera Instruments
    pH 4.00 Calibration Buffer Solution 8 oz, 0.01 pH Accuracy at 25°C (77°F) High Accuracy (±0.01 pH): standardized against NIST certified pH references within 0.01 pH at 25°C (77°F). Ideal for the calibration of all kinds of pH meters/testers Color-coded, D (1 per EA )
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    was $11.00 Special Price $9.50
  15. Phosphate Buffer,0.05 M,pH 7.4, 4.00 L Poly natural
    Manufacturer: Reagents Inc
    Phosphate Buffer,0.05 M,pH 7.4, 4.00 L Poly natural (1 per EA )
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    was $105.00 Special Price $80.78
  16. Starch Indicator, 0.5 Percent (w/v) Aqueous Solution, Stabilized, 500mL, CAS# 9005-84-9
    Manufacturer: Spectrum Chemical
    Starch Indicator, 0.5 Percent (w/v) Aqueous Solution, Stabilized 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 $137.25 Special Price $131.99
  17. Potassium Iodide, 15% w/v, 1.00 L Glass amber
    Manufacturer: Reagents Inc
    Potassium Iodide, 15% w/v, 1.00 L Glass amber (1 per EA )
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    was $88.50 Special Price $65.88
  18. Ammonium Oxalate, Saturated, 1.00 L Poly natural
    Manufacturer: Reagents Inc
    Ammonium Oxalate, Saturated, 1.00 L Poly natural (1 per EA )
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    was $125.00 Special Price $93.96
  19. Tetra-n-butylammonium Hydroxide, 1.0 M Aqueous Solution, 100mL, CAS# 2052-49-5
    Manufacturer: Spectrum Chemical
    Tetra-n-butylammonium Hydroxide, 1.0 M Aqueous Solution is a chemical compound that is frequently used as a strong base in organic chemistry and is used under phase-transfer conditions to effect alkylation and deprotonation.

    (1 per EA )
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    $540.95
  20. Ammonium Chloride Hydroxide Buffer, pH 9.5, 3.8 L
    Manufacturer: 710 Spirits Rocky Mtn Reagents
    Ammonium Chloride Hydroxide Buffer, pH 9.5, 3.8 L (1 per EA)
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    $51.20
  21. Vario Lr Cod Reagent, Mercury-Free 0-150 Mg/L; 25 Vials, Ea/1
    Manufacturer: Lovibond Tintometer Group
    Direct Replacement for Hach P/N 2565025. Reagent COD Vario Vials 0-150 mg/l, Mercury Free, 16mm ø Pack Size 25 (1 per EA)
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    $60.30
  22. Formaldehyde, 37% purified, 1.00 L Poly natural
    Manufacturer: Reagents Inc
    Formaldehyde, 37% purified, 1.00 L Poly natural (1 per EA )
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    was $64.50 Special Price $48.60
  23. Potassium Chloride, 6% w/v, 20.00 L Cubitainer
    Manufacturer: Reagents Inc
    Potassium Chloride, 6% w/v, 20.00 L Cubitainer (1 per EA )
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    was $239.00 Special Price $179.28
  24. Sulfuric Acid, 5.0N (2.5M), 2.5L, Clear Glass
    Manufacturer: LabChem
    Shelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)
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    was $90.70 Special Price $69.77
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