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. tert-Butyl Hydroperoxide, 70 Percent Solution in Water, 25mL, CAS# 75-91-2
    Manufacturer: Spectrum Chemical
    tert-Butyl Hydroperoxide, 70 Percent Solution in Water, with a systematic name of tert-Butyl hydroperoxide, is used in a variety of oxidation processes. 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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    $79.75
  2. EDTA Disodium, 0.01M, 1 ml = 1 mg CaCO3 With Mg, Solution, 1L, CAS# 78-10-4
    Manufacturer: Spectrum Chemical
    EDTA Disodium, 0.01M, 1 ml = 1 mg CaCO3 With Mg, Solution, is also referred to as Ethylenediaminetetraacetic acid. It is a solid that has no color and is water soluble. It is mainly used as a complexing agent for the dissolution of metal ions in fields such as medicine, industry, cosmetics and laboratories.

    (1 per EA )
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    was $368.15 Special Price $299.56
  3. Ethyl Glyoxylate, (47 Percent in Toluene), 100g, CAS# 924-44-7
    Manufacturer: Spectrum Chemical
    Ethyl Glyoxylate, (47 Percent in Toluene) (1 per EA )
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    $252.45
  4. Sodium Thiosulfate, 0.2N (0.2M), 20L, Cubitainer®
    Manufacturer: LabChem
    Shelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)
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    was $248.80 Special Price $191.40
  5. Sodium Hydroxide, 10.0N (10.0M), 4L, Poly Bottle
    Manufacturer: LabChem
    Shelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)
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    was $131.30 Special Price $101.01
  6. Mcilvaine'S Buffer pH 3.2, 4L, Poly Bottle
    Manufacturer: LabChem
    Shelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)
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    was $76.20 Special Price $57.15
  7. Tartaric Acid 10% W/V, 1L, Poly Bottle
    Manufacturer: LabChem
    Shelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)
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    was $84.70 Special Price $65.16
  8. Diluted Hydrochloric Acid, 10 Percent (w/v), NF, 500mL, CAS# 7647-01-0
    Manufacturer: Spectrum Chemical
    Diluted Hydrochloric Acid, 10 Percent (w/v), NF is a pH acidifier excipient. All Spectrum Chemical NF grade products are manufactured, packaged and stored under current Good Manufacturing Practices (cGMP). (1 per EA )
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    was $171.00 Special Price $126.49
  9. Sodium Lauryl Sulfate, 0.004 N, 4.00 L Poly natural
    Manufacturer: Reagents Inc
    Sodium Lauryl Sulfate, 0.004 N, 4.00 L Poly natural (1 per EA )
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    was $376.00 Special Price $281.88
  10. Hydrochloric Acid, 50 Percent (v/v), Aqueous Solution, APHA, 200L, CAS# 7647-01-0
    Manufacturer: Spectrum Chemical
    Hydrochloric Acid, 50 Percent (v/v), Aqueous Solution, APHA 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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    $2,438.90
  11. Potassium Hydroxide, 0.1N (0.1M), 4L, Poly Bottle
    Manufacturer: LabChem
    Shelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)
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    was $125.30 Special Price $93.97
  12. Sodium Hydroxide, 10.0N (10.0M), 20L, Cubitainer®
    Manufacturer: LabChem
    Shelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)
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    was $415.40 Special Price $319.57
  13. Sulfuric Acid, 4.0N (2.0M), 10L, Cubitainer®
    Manufacturer: LabChem
    Shelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)
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    was $201.40 Special Price $154.95
  14. Ammonium Sulfide Solution, Reagent, ACS, 500mL, CAS# 12135-76-1
    Manufacturer: Spectrum Chemical
    Ammonium Sulfide Solution, Reagent, ACS is an unstable salt with the formula (NH4)2S. Common uses of AMMONIUM SULFIDE are industrial applications including photo developing and textile manufacturing. As an ACS grade quality reagent, its chemical specifications are the de facto standards for chemicals used in many high-purity applications and typically designate the highest quality chemical available for laboratory use. Spectrum Chemical manufactured Reagent ACS grade products meet the toughest regulatory standards for quality and purity.

    (6 per CS )
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    was $2,168.95 Special Price $1,283.55
  15. Buffer Solution pH 2.0, 4L, Poly Bottle
    Manufacturer: LabChem
    Shelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)
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    was $142.70 Special Price $107.03
  16. Free Polymer Reagent #1, 16 oz
    Manufacturer: Taylor Technologies
    Free Polymer Reagent #1, 16 oz (1 per EA)
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    was $112.48 Special Price $85.92
  17. Sulfuric Acid, 0.05N (0.025M), 1L, Poly Bottle
    Manufacturer: LabChem
    Shelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)
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    was $37.70 Special Price $29.00
  18. Eosin Y TS, (U.S.P. Test Solution), 1L, CAS# 587-02-0
    Manufacturer: Spectrum Chemical
    Eosin Y 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 $299.40 Special Price $287.92
  19. Titration Solvent, Mixture, Isopropyl Alcohol : Toluene (1:1), ASTM, 4L
    Manufacturer: Spectrum Chemical
    Titration Solvent, Mixture, Isopropyl Alcohol : Toluene (1:1), ASTM Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration. Toluene-isopropyl alcohol solvent blend. Capable of dissolving the test materials, with sufficient polarity for the method. Low inherent acid value: suitable for use as a blank.

    (4 per CS )
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    $1,250.70
  20. Rd 125 Reactor 24 Tube Capacity , 16 mm, ; 230/115 V/50-60 Hz, Ea/1
    Manufacturer: Lovibond Tintometer Group
    Chemical digestion of samples is required for the photometric determination of COD, TOC, total phosphate and total nitrogen. The required temperatures and reaction time can be selected by using the membrane keypad of the reactor RD 125. The unit works at (1 per EA)
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    $1,311.40
  21. Sulfuric Acid, 0.005 N, HPLC, 4.00 L Glass amber
    Manufacturer: Reagents Inc
    Sulfuric Acid, 0.005 N, HPLC, 4.00 L Glass amber (1 per EA )
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    was $85.00 Special Price $63.72
  22. Potassium Hydroxide, 10% w/v, 500.00 mL Poly natural
    Manufacturer: Reagents Inc
    Potassium Hydroxide, 10% w/v, 500.00 mL Poly natural (1 per EA )
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    was $36.00 Special Price $27.00
  23. Sodium Citrate TS, Alkaline - 100mL
    Manufacturer: Dawn Scientific
    Sodium Citrate TS, Alkaline - 100mL (1 per EA )
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    was $49.62 Special Price $48.38
  24. Manganese Chloride 1M Solution, 100 Milliliters CAS# 7732-18-5, 7773-01-5
    Manufacturer: Research Products International
    Mol. Wt: Common Name: Manganese Dichloride Formula: Dimensions: 3.38 x 4.63 x 3.38, Weight: 0.25, Cas#: 7732-18-5, 7773-01-5 Research or further manufacturing use only, not for food or drug use. (1 per EA)
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    $84.85
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