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Buffer Solution pH 2, 1 Pint

$30.00
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SKU: ZB1626-16
California prop 65
Description
  • What it is. This pH 2 buffer solution is a strongly acidic pH standard used to calibrate pH meters and electrodes for samples below the range covered by pH 4 buffer. It is supplied in a 1-pint size.
  • When pH 2 calibration is needed. Standard calibration with pH 4 and pH 7 covers mildly acidic samples. When samples run below pH 3, such as acid rinses, pickling and plating baths, acidic process streams, or strongly acidic beverages and food ingredients, a pH 2 buffer brackets the measurement so the meter interpolates instead of extrapolating.
  • How a buffer holds its pH. A buffer contains a weak acid and its conjugate base, or a weak base and its conjugate acid, in balanced amounts. When small amounts of acid or base enter the solution, one partner neutralizes them, so the pH barely moves. That resistance to change is what makes a buffer a reliable reference point for calibration, unlike plain water.
  • Accuracy at low pH. At low pH, glass electrodes can show acid error, reading slightly higher than the true value. Calibrating close to the measurement range with a pH 2 buffer helps keep low-pH readings accurate and makes electrode problems easier to detect.
  • Stable in storage. Acidic buffers are far less affected by carbon dioxide than alkaline buffers, so pH 2 buffer stays stable in use when the container is kept closed. Pour only what you need for each calibration and discard used portions rather than returning them to stock.
  • Temperature matters. Buffer pH shifts slightly with temperature. Calibrate at the same temperature as your samples, use automatic temperature compensation, and apply temperature-correction values supplied with the buffer when available.
  • Calibration best practice. Rinse the electrode with deionized water and blot it gently between buffers, immerse it in a fresh portion of buffer in a clean beaker, stir gently, and wait for a stable reading before accepting each point. Calibrate before each day's measurements, or more often as the method requires, and record the meter-reported slope to track electrode health.
  • Where it is used. Use pH 2 buffer in metal finishing and plating, chemical manufacturing, battery and electronics production, food and beverage QC for highly acidic products, and research labs working with strong acids. It pairs with Lab Pro's Buffer Solution pH 4, Red and Buffer Solution pH 7, Yellow for calibration across the acidic range.

Technical Specifications

Product pH 2 buffer solution
Nominal pH 2 at 25 °C
Use Low-pH meter calibration
Package Size 1 pint

Applications / Common Uses

  • Low-pH calibration: Extends meter calibration below pH 4.
  • Plating and pickling baths: Supports measurements of strongly acidic metal-finishing solutions.
  • Acidic process streams: Supports accurate readings in chemical production.
  • Food and beverage QC: Calibrates for highly acidic products and ingredients.
  • Electrode performance checks: Reveals acid error in glass electrodes.

Storage, Handling & Shipping

Store pH 2 buffer tightly closed at room temperature, protected from light and freezing. Keep it free of contamination by pouring portions into a clean beaker for each calibration and never dipping an electrode into the stock.

  • Storage temperature: Store at room temperature and protect from light and freezing.
  • Contamination control: Pour the amount needed into a clean beaker; never return used buffer to stock or dip an electrode into the stock container.
  • Shelf life: Use before the expiration date on the label; once opened, use within the period stated on the certificate or label.
  • Personal protection: Wear safety glasses and gloves; strongly acidic solutions can irritate skin and eyes.
  • Rinsing: Rinse electrodes with deionized water between buffers to prevent carryover.

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FAQs

When should I calibrate with pH 2 buffer?

Use pH 2 buffer when samples measure below about pH 3, such as acid rinses, plating baths, or strongly acidic process streams. Calibrating near the sample range keeps readings within calibrated points. Without it, the meter extrapolates from pH 4, which adds error to low-pH measurements.

What is acid error in a pH electrode?

At strongly acidic pH, some glass electrodes read slightly higher than the true value, an effect called acid error. Calibrating with a buffer close to the sample range, such as pH 2, reduces its impact and helps you notice when an electrode is no longer responding correctly.

Is pH 2 buffer stable after opening?

Acidic buffers are much less sensitive to carbon dioxide than alkaline ones, so pH 2 buffer holds its value well when kept closed. Contamination is the bigger risk. Pour portions into a clean beaker, never dip electrodes into the stock, and follow the use period on the label.

Can I combine pH 2 buffer with pH 4 and pH 7?

Yes. A three-point calibration with pH 2, pH 4, and pH 7 covers strongly to mildly acidic samples with good accuracy. Many meters accept custom buffer sets, so check that your meter recognizes pH 2 or allows manual entry of the buffer value before calibrating.

Is pH 2 buffer hazardous?

Strongly acidic solutions can irritate skin and eyes, so wear safety glasses and gloves and rinse splashes with plenty of water. The exact hazard classification depends on the buffer's formulation, so check the safety data sheet supplied with the product before use, storage, and disposal.