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, 0.1 N, Aqueous Solution, 4L, CAS# 7647-01-0
    Manufacturer: Spectrum Chemical
    Hydrochloric Acid, 0.1 N, Aqueous Solution is a colorless, clear, highly corrosive, highly pungent solution of hydrogen chloride in water. 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.

    (4 per CS )
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    was $397.10 Special Price $323.11
  2. Barium Chloride, 0.025 M/0.05N, 20.00 L Cubitainer
    Manufacturer: Reagents Inc
    Barium Chloride, 0.025 M/0.05N, 20.00 L Cubitainer (1 per EA )
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    was $550.00 Special Price $412.56
  3. Sodium Fluoride, 0.1 M, 500.00 mL Poly natural
    Manufacturer: Reagents Inc
    Sodium Fluoride, 0.1 M, 500.00 mL Poly natural (1 per EA )
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    was $103.00 Special Price $77.76
  4. Sodium Hydroxide 30% W/V, 4L, Poly Bottle
    Manufacturer: LabChem
    Shelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)
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    was $126.20 Special Price $97.09
  5. Reagent Alcohol, 70 Percent (v/v) Solution, 1L, CAS# 64-17-5
    Manufacturer: Spectrum Chemical
    Reagent Alcohol, 70 Percent (v/v) Solution (1 per EA )
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    was $38.80 Special Price $31.57
  6. Sodium Chloride 30% W/V, 4L, Poly Bottle
    Manufacturer: LabChem
    Shelf Life (months): 36, Traceable to NIST, UN Number: (1 per EA)
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    was $224.40 Special Price $172.64
  7. Sulfuric Acid, 0.1N (0.05M), 10L, Cubitainer®
    Manufacturer: LabChem
    Shelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)
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    was $146.40 Special Price $112.62
  8. Ammonia Solution, FCC, 4L, CAS# 1336-21-6
    Manufacturer: Spectrum Chemical
    Ammonia Solution, FCC is a solution of Ammonia in water. It has many uses, but in food production it is used primarily as a leavening agent. Spectrum Chemical offers over 300 Food Grade (FCC) chemical ingredients packaged in laboratory size bottles to production drum quantities and are manufactured, packaged and stored under current Good Manufacturing Practices (cGMP) per 21CFR part 211 in FDA registered and inspected facilities.

    (4 per CS )
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    was $905.70 Special Price $736.96
  9. Vario Silica Hr Molybdate Reagent, F25 100 Pack, Ea/1
    Manufacturer: Lovibond Tintometer Group
    Direct Replacement for Hach P/N 104199. (1 per EA )
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    $44.93
  10. Sulfuric Acid, 0.2 N, 4.00 L Poly natural
    Manufacturer: Reagents Inc
    Sulfuric Acid, 0.2 N, 4.00 L Poly natural (1 per EA )
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    was $85.00 Special Price $63.72
  11. Mercuric Chloride TS - 100mL
    Manufacturer: Dawn Scientific
    Mercuric Chloride TS - 100mL (1 per EA )
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    was $64.62 Special Price $63.01
  12. Hydroxylamine HCl, 0.5 N, 4.00 L Poly natural
    Manufacturer: Reagents Inc
    Hydroxylamine HCl, 0.5 N, 4.00 L Poly natural (1 per EA )
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    was $230.00 Special Price $172.80
  13. Silver Nitrate, 0.1N (0.1M), 20L, Cubitainer®
    Manufacturer: LabChem
    Shelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)
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    was $2,275.70 Special Price $1,706.78
  14. Sodium Hydroxide, 25% w/w Solution, 500 mL
    Manufacturer: 710 Spirits Rocky Mtn Reagents
    Caustic Soda (1 per EA)
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    $24.15
  15. Sodium Thiosulfate 8% W/V, 4L, Poly Bottle
    Manufacturer: LabChem
    Shelf Life (months): 24, , UN Number: (1 per EA)
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    was $99.60 Special Price $76.62
  16. Sodium Hydroxide, 0.313N (0.313M), 4L, Poly Bottle
    Manufacturer: LabChem
    Shelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)
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    was $91.80 Special Price $70.63
  17. Starch Indicator 1%, 20L, Cubitainer®
    Manufacturer: LabChem
    Shelf Life (months): 12, , UN Number: (1 per EA)
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    was $359.60 Special Price $276.64
  18. Potassium Hydroxide, 45 Percent (w/w) Aqueous Solution, Reagent, 500mL, CAS# 1310-58-3
    Manufacturer: Spectrum Chemical
    Potassium Hydroxide, 45 Percent (w/w) Aqueous Solution, Reagent is an aqueous solution of Caustic Potash and is the protypical strong base. Its reagent grade means this is the highest quality commercially available for this chemical and that the American Chemical Society has not officially set any specifications for this material.

    (6 per CS )
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    was $474.05 Special Price $385.73
  19. Hydrochloric Acid, 0.1 N, Aqueous Solution, 4L, CAS# 7647-01-0
    Manufacturer: Spectrum Chemical
    Hydrochloric Acid, 0.1 N, Aqueous Solution is a colorless, clear, highly corrosive, highly pungent solution of hydrogen chloride in water. 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.

    (1 per EA )
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    was $120.05 Special Price $97.69
  20. Potassium Chloride, 3 M Aqueous Solution, 500mL, CAS# 3184-13-2
    Manufacturer: Spectrum Chemical
    Potassium Chloride, 3 M Aqueous Solution - 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 $74.95 Special Price $60.99
  21. Iodine Monochloride, Solution, 500mL, CAS# 7790-99-0
    Manufacturer: Spectrum Chemical
    Iodine Monochloride, Solution is used as an iodination reagent in organic synthesis. 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 $132.70 Special Price $107.97
  22. Starch 0.5% W/V W/Chloroform, 1L, Poly Bottle
    Manufacturer: LabChem
    Shelf Life (months): 12, , UN Number: (1 per EA)
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    was $59.20 Special Price $45.55
  23. Sodium Thiosulfate, 0.025N (0.025M), 10L, Cubitainer®
    Manufacturer: LabChem
    Shelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)
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    was $195.50 Special Price $150.40
  24. Sodium Tartrate 10% W/W, 500ML, Poly Bottle
    Manufacturer: LabChem
    Shelf Life (months): 24, , UN Number: (1 per EA)
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    was $99.80 Special Price $76.78
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