The Ph (Hydrogen Potential) - Fagor Brandt HERAKLES LA3P 001UK-0306 Manual

THE WATER

3.4. - The pH (hydrogen potential)

Maybe, you have already remarked on labels of cleaning products or drinks the pH indication followed
by a number. Maybe, you know that the pH is related to the acidity of a solution, sometimes verifiable
by its taste. If you taste successively lemon juice, coffee and water, you will be able without any
difficulty to rank these three liquids by level of acidity.
The pH paper is used for approximate, simple and rapid determination of the pH of a solution.
This paper, which does not provide exact determination of a value of pH, rather gives an idea of the
pH range of the solution, namely:
•
Acid for a pH smaller than 7
•
Neutral for a pH equal to 7
•
Basic or alkaline for a pH greater than 7
Water, mineralized or not (and, therefore, salt water) has a pH very close to 7.
3.4.1. - A few acids
•
Vinegar (acetic acid)
•
Aspirin (acetylsalicylic acid)
•
Lemon guise (citric acid)
•
Coffee
•
Vitamin C (ascorbic acid)
•
Dishwasher rinsing product
3.4.2. - A few bases
•
Household cleaning products (ammonia)
•
Soap (potassium hydroxide)
•
Concentrated bleach
•
Sink caustic cleaner (sodium hydroxide)
•
Detergent products for washing machine and dishwasher
Alkaline pH is necessary for the washing bath to ensure maximum efficiency.
3.4.3. - Analysis of traces or deposits on dishes
Replacing a component supposed defective does not constitute the essentials of the maintenance of
a dishwasher. A dishwasher, for which the consumer signals a bad wash result, cannot be repaired so
easily. Actually, to solve this type of claim, it will always be necessary to precisely identify the nature
of the trace or residue present on the piece of dishes. Only this precise identification can indicate us
the probable cause at the origin of the defect.
The matter is not to precisely measure the pH but simply to detect the origin of the white traces or of
the residues.
So, when the paper turns red we are in the presence of an acid solution (rinsing product for example),
if it turns blue, then it is an alkaline solution (washing product).
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Red
Acid
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Blue
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