The rate and outcome of chemical reactions taking place in water often depends on the acidity of the water, and it is therefore useful to know the acidity of the water, typically measured by means of a pH meter.Knowledge of pH is useful or critical in many situations, including chemical laboratory analyses. pH meters are used for soil measurements in agriculture, water quality for municipal water supplies, swimming pools, environmental remediation; brewing of wine or beer; manufacturing, healthcare and clinical applications such as blood chemistry; and many other applications
Backlit screen;Small size;Portable ;Economical ;High accuracy ;With ATC
1.Remove the protective cap.
2.Clean the electrode with distilled water,and dry up the water attached to the electrode with filter paper.
3.Turn on the pH meter.
4.Insert the pH meter into the test solution,with the measuring electrode immersed in.
5.Stir gently for a while to get the stable numerical result displayed on the screen.
6.Clean the electrode after using,then turn off the pH meter and put on the protective cap.
|The pH scale |
The values for pH make more sense when compared with that of known substances. Note that the pH scale is logarithmic and that each next value contains ten times less hydrogen ions. A pH=0 contains the most, and is highly acidic.
|0||5% Sulphuric acid, H2SO4, battery acid.|
|1||0.1 N HCl, hydrochloric acid (1.1)|
|2||Lemon juice. Vinegar (2.4-3.4)|
|4||Orange juice. Apple juice (3.8). Beer. Tomatoes.|
|5||Cottage cheese. Black coffee. Rain water 5.6.|
|6||Milk. Fish (6.7-7). chicken (6.4-6.6).|
|7||Neutral: equal numbers of hydrogen and hydroxyl ions. Blood (7.3-7.4). Distilled water without CO2, after boiling.|
|8||Sea water (8.1). Egg white.|
|9||Borax. baking soda.|
|10||Milk of magnesia, Magnesium hydroxide Mg (OH)2.|
|12||Photographic developer, household bleach|
|14||Sodium lye NaOH, 1 mol/litre.|
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