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Apparatus, supplies and reagents
Figure 1. Metrohm Autotitrator (Note: dispenses 0.1 M HCl).
Laboratory apparatus
Hardware and software
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- Metrohm Titrino 794 autotitrator
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- LabVIEW Alkalinity program v6.
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- Laboratory oven
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- Desiccator
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- Water bath
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- Analytical balance system
Figure 1. Metrohm Autotitrator (Note: dispenses 0.1 M HCl).
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Supplies
- | Pipettes, Class A: 0.5, 2, 3, 5, 8, 10, and 20 ml |
- | Adjustable pipettor, 100–5000 µl |
- | Volumetric flasks, Class A: 100 ml, 1 l |
- | Combination electrode (Metrohm, combined pH glass electrode, model 6.0234.100) |
- | pH paper, to bracket pH 7 (pH 1–12 paper) |
- | 5 ml snap-cap vials |
- | Magnetic stir bars |
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Before an electrode can be used, it must be calibrated against pH buffers in the range expected in samples. Generally, calibration at pH 4, 7 and 10 covers the necessary range. Make sure the gray side-hole plug for the electrode is unplugged before starting a measurement.
Figure 3. Electrode calibration.
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