Yellow Square pH 9.18 powder is a calibration reagent for the alkaline point of a pH meter. Dissolved in 250 ml of distilled or deionised water at 25 °C, it forms a reference buffer solution for home and lab calibration.
Specifications
| Parameter | Value |
|---|---|
| Buffer pH | 9.18 pH |
| Water temperature | 25 °C |
| Water volume | 250 ml |
| Water type | distilled or deionised |
| Purpose | calibration of pH meters at home and in the lab |
| Powders in the line | pH 4.01, pH 6.86, pH 9.18 |
What you get
- The upper, alkaline calibration point — a pH 9.18 buffer to check the meter in the alkaline range.
- A partner for the neutral buffer — pH 6.86 is in the same line, and pH 4.01 covers the acidic side.
- Fresh reference — the powder is dissolved right before calibration, so the solution has little time in contact with air.
- Clear preparation — 250 ml of distilled or deionised water at 25 °C.
- Home and lab use — for pH meters in both settings.
Who it is for
Users whose readings often fall in the alkaline range, such as pool owners, hard-water aquarium keepers, process technicians and lab staff, plus anyone who calibrates at two or three points.
Who it is not for
People who only work in the acidic range, where the pH 4.01 powder fits better, or who want a ready-made liquid solution. If your meter's manual requires other buffer values, follow it.
Uses and compatibility
Calibration of pH meters at home and in the lab: dissolve the powder in 250 ml of distilled or deionised water at 25 °C, immerse the rinsed electrode straight away and set the meter to pH 9.18 as its manual describes.
What's in the box
pH 9.18 calibration powder; the amount per pack is not stated by the supplier.
Questions and answers
When do I need a pH 9.18 alkaline buffer?
When your readings are in the alkaline range, or when you calibrate at several points including the upper one.
Can I leave the prepared solution open?
Better not: an alkaline solution reacts with carbon dioxide in the air. Prepare it just before calibration and keep it covered.
How much water is the powder for?
250 ml of distilled or deionised water at 25 °C.
What else will I need?
Distilled or deionised water, a clean container and your pH meter's manual with its calibration procedure.
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