Indicator buffer tablets, 100 unit(s)
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.
excl. VAT. | 100 unit(s) per Pack Qty.
Art. No. 7649.1
Now recurring orders conveniently delivered as a subscription!
With the new Carl Roth Replenishment Service you can let products be ordered automatically which you need regularly in your lab!How it works:
Put all products for your subscription in the desired quantity in the basket.
In the shopping cart, select the option "Order shopping cart as subscription" Order as subscription.
Set Starty point and interval for your subscription and submit order!
By the way: Through your account you can customize or delete your subscriptions anytime.
- Subtotal: 0.00
|Order No.||Pack Qty.||Pack.||Price||Quantity|
Delivery date currently unknown
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.
|Suitability as indicator||complies|
|Disintegration time (25 °C)||100 s|