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Indicator buffer tablets, 100 unit(s)

for the determination of water hardness with EDTA
Icon_EVE-EUD Please consider that this product might be liable to some legal sanctions as for example to obtain an end user declaration or the prohibition of some applications. For details please do contact your counterpart in our sales department!
Examples of effect: Lead to damage to heath, cause irritation to eyes, skin or respiratory organs. Are fatal in larger quantities. Safety: As previously stated, in the event of skin irritation or contact with eyes, rinse with water or a suitable medium.
Warning
H302-H317-H319
i harmful if swallowed, may cause an allergic skin reaction, causes serious eye irritation
P261 P280 P301+P312 P305+P351+P338 P330 P501
i avoid breathing dust/fume/gas/mist/vapours/spray, wear protective gloves/eye protection/face protection, IF SWALLOWED: Call a POISON CENTER/doctor if you feel unwell, IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing, rinse mouth, dispose of contents/container in accordance with local/regional/national/international regulations
Pack Qty.
Pack.
WGK 1

Non-binding application proposal:
Dissolve one tablet in 50 ml water sample and bring to pH 11 with approx. 1 ml ammonia solution 30 % (art. CP17). Titrate with EDTA disodium salt volumetric solution (art. T136 or T137) from red to green.

€32.15/Pack Qty. 

excl. VAT. | 100 unit(s) per Pack Qty.

Art. No. 7649.1

In stock
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Indicator buffer tablets
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Art. No. Pack Qty. Pack. Price Quantity
7649.1 100 unit(s) plastic

€32.15

7649.2 500 unit(s) plastic

€85.90

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Downloads / MSDS


General information

Determination of Water Hardness

Water contains a whole host of salts and other compounds in addition to the gases dissolved in it (oxygen, nitrogen, carbon dioxide). Its most important constituents are magnesium and calcium in the form of their chlorides, sulphates and bicarbonates. These dissolved salts are known as hardeners. The bicarbonates precipitate in the heat (during boiling) as carbonates and are known as carbonate hardness or temporary hardness. The sulphate and chloride compounds are known as permanent hardness or non-carbonate hardness. Total hardness describes the concentration of alkaline earth metal ions in water.

The unit of measurement for water hardness used to be 1 °dH (German degrees of hardness), which corresponds to 10,00 mg CaO or 7,19 mg MgO in one litre of water. Today we use millimoles per litre (mmol/l), whereby 1 °dH corresponds to 0,18 mmol/l of earth metal ions and 1 mmol/l corresponds to 5,6 °dH.


Indicators and Dyes

Carl ROTH offers many indicators and dyes of high purity, which can be used in special applications.


Certificates of Analysis

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The following analysis certificates have been found:

Type analysis

Suitability as indicatorcomplies
Disintegration time (25 °C)100 s