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, 0.0333 N, 20.00 L Cubitainer
    Manufacturer: Reagents Inc
    Hydrochloric Acid, 0.0333 N, 20.00 L Cubitainer (1 per EA )
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    was $207.00 Special Price $155.52
  2. Buffer, pH 4.00, Red, 200.00 L Drum
    Manufacturer: Reagents Inc
    Buffer, pH 4.00, Red, 200.00 L Drum (1 per EA )
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    was $875.00 Special Price $656.64
  3. Silver Nitrate, 0.01 N, 1.00 L Glass amber
    Manufacturer: Reagents Inc
    Silver Nitrate, 0.01 N, 1.00 L Glass amber (1 per EA )
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    was $85.50 Special Price $63.72
  4. Potassium Iodide and Starch TS - 100mL
    Manufacturer: Dawn Scientific
    Potassium Iodide and Starch TS - 100mL (1 per EA )
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    was $54.62 Special Price $53.25
  5. Ammoniacal Potassium Fericyanide TS - 500mL
    Manufacturer: Dawn Scientific
    Ammoniacal Potassium Fericyanide TS - 500mL (1 per EA )
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    was $99.62 Special Price $97.12
  6. Acid Stannous Chloride TS - 500mL
    Manufacturer: Dawn Scientific
    Acid Stannous Chloride TS - 500mL (1 per EA )
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    was $74.62 Special Price $72.76
  7. Sodium Acetate TS - 100mL
    Manufacturer: Dawn Scientific
    Sodium Acetate TS - 100mL (1 per EA )
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    was $34.62 Special Price $33.75
  8. VB HA (Hydrochloric Acid 2 N), 1.00 L Poly natural
    Manufacturer: Reagents Inc
    VB HA (Hydrochloric Acid 2 N), 1.00 L Poly natural (1 per EA )
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    was $274.00 Special Price $205.20
  9. Sulfuric Acid 3.2 N, 20.00 L Winpak
    Manufacturer: Reagents Inc
    Sulfuric Acid 3.2 N, 20.00 L Winpak (1 per EA )
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    was $265.00 Special Price $198.72
  10. Potassium Hydroxide, SVS Concentrate, To Prepare 0.5 N Solution, 1UNIT, CAS# 1310-58-3
    Manufacturer: Spectrum Chemical
    Potassium Hydroxide, SVS Concentrate, To Prepare 0.5 N Solution (1 per EA )
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    $95.70
  11. Sodium Hydroxide-d, 99+ Atom Percent D, 40 Percent (w/w) solution in D2O, 10g, CAS# 14014-06-3
    Manufacturer: Spectrum Chemical
    Sodium Hydroxide-d, 99+ Atom Percent D, 40 Percent (w/w) solution in D2O - Spectrum offers a broad range of high quality deuterated products for all your routine synthesis and structural analysis needs and is the preferred brand for deuterated NMR solvents worldwide. We offer Isotopic Enrichment ranges from 97 atom % D for routine use to 99.97 atom % D for the most demanding applications.

    (1 per EA )
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    $666.02
  12. Hydrochloric Acid, SVS Concentrate, To Prepare 0.01 N Solution, 1UNIT, CAS# 7647-01-0
    Manufacturer: Spectrum Chemical
    Hydrochloric Acid, SVS Concentrate, To Prepare 0.01 N Solution is a colorless, clear, highly corrosive, highly pungent concentrate of hydrogen chloride in water. Spectrum's Standard Volumetric Solution (SVS) concentrate when diluted to 1 liter will yield a 0.01 N solution. As an monoprotic acid and one of the six common strong mineral acids it is the least likely to be subject to an oxidation-reduction reaction. Hydrochloric acid is frequently used during chemical analysis to prepare samples for analysis. It reacts with basic compounds, turning them into dissolved chlorides that can then undergo analysis.

    (6 per CS )
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    $347.15
  13. Potassium Dichromate, SVS Concentrate, To Prepare 0.1 N Solution, 1UNIT, CAS# 7778-50-9
    Manufacturer: Spectrum Chemical
    Potassium Dichromate, SVS Concentrate, To Prepare 0.1 N Solution - Spectrum's Standard Volumetric Solution (SVS) concentrate when diluted to 1 liter will yield a 0.1 N solution. Simply dilute the desired Standard Volumetric Solution concentrate to the specified volume (carefully following instructions provided with the package) and the resulting solution will have an exact Normality within 0.1%. Spectrum Standard Volumetric Solution concentrates are relied upon for fast, accurate results in life sciences and pharmaceutical quality control applications.

    (6 per CS )
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    $776.55
  14. Potassium Hydroxide, SVS Concentrate, To Prepare 0.1 N Solution, 1UNIT, CAS# 1310-58-3
    Manufacturer: Spectrum Chemical
    Potassium Hydroxide, SVS Concentrate, To Prepare 0.1 N Solution - Spectrum's Standard Volumetric Solution (SVS) concentrate when diluted to 1 liter will yield a 0.1 N solution. Simply dilute the desired Standard Volumetric Solution concentrate to the specified volume (carefully following instructions provided with the package) and the resulting solution will have an exact Normality within 0.1%. Spectrum Standard Volumetric Solution concentrates are relied upon for fast, accurate results in life sciences and pharmaceutical quality control applications.

    (6 per CS )
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    $344.40
  15. Potassium Permanganate, SVS Concentrate, To Prepare 0.1 N Solution, 1UNIT, CAS# 7722-64-7
    Manufacturer: Spectrum Chemical
    Potassium Permanganate, SVS Concentrate, To Prepare 0.1 N Solution - Spectrum's Standard Volumetric Solution (SVS) concentrate when diluted to 1 liter will yield a 0.1 N solution. Simply dilute the desired Standard Volumetric Solution concentrate to the specified volume (carefully following instructions provided with the package) and the resulting solution will have an exact Normality within 0.1%. Spectrum Standard Volumetric Solution concentrates are relied upon for fast, accurate results in life sciences and pharmaceutical quality control applications.

    (1 per EA )
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    $322.15
  16. Total Ionic Strength Adjustment Buffer A for Calcium Ion Electrodes (8 oz)
    Manufacturer: Apera Instruments
    Total Ionic Strength Adjustment Buffer A for Calcium Ion Electrodes (8 oz) (1 per EA )
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    was $35.00 Special Price $30.24
  17. Total Ionic Strength Adjustment Buffer E for Nitrate Ion Electrodes (8 oz)
    Manufacturer: Apera Instruments
    Total Ionic Strength Adjustment Buffer E for Nitrate Ion Electrodes (8 oz) (1 per EA )
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    was $35.00 Special Price $30.24
  18. Sodium Hypochlorite 12.5-15% - 1Gal, CAS#7681-52-9
    Manufacturer: Dawn Scientific
    Sodium Hypochlorite 12.5-15% - 1Gal, CAS#7681-52-9 (1 per EA )
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    was $119.62 Special Price $116.63
  19. Sodium Hypochlorite 5% ACS - ACS, 1L, CAS#7681-52-9
    Manufacturer: Dawn Scientific
    Sodium Hypochlorite 5% ACS - ACS, 1L, CAS#7681-52-9 (1 per EA )
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    was $52.62 Special Price $51.30
  20. Vario pHospHate 3, F10 50 Pack, Ea/1
    Manufacturer: Lovibond Tintometer Group
    Direct Replacement for Hach P/N 2106046. (1 per EA )
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    $22.57
  21. Hydrochloric Acid, 5% v/v, 4.00 L Poly natural
    Manufacturer: Reagents Inc
    Hydrochloric Acid, 5% v/v, 4.00 L Poly natural (1 per EA )
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    was $70.50 Special Price $52.92
  22. Calmagite Indicator, 0.1% w/v, 500.00 mL Glass amber
    Manufacturer: Reagents Inc
    Calmagite Indicator, 0.1% w/v, 500.00 mL Glass amber (1 per EA )
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    was $53.50 Special Price $39.96
  23. Heartwood Indicator B, 500.00 mL Glass amber
    Manufacturer: Reagents Inc
    Heartwood Indicator B, 500.00 mL Glass amber (1 per EA )
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    was $43.50 Special Price $32.40
  24. Iodine, 1.7076 g/L, 500.00 mL Glass amber
    Manufacturer: Reagents Inc
    Iodine, 1.7076 g/L, 500.00 mL Glass amber (1 per EA )
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    was $89.00 Special Price $66.96
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