Hardness, Total, EDTA Titration method, Reagent Kit
Backorder Now, once ordered your item will dispatch before the 28th of May 2025, call 1300 737 871 (NZ 0800 737 871 to confirm).
The HI3812-100 are reagents for the determination of total hardness (as CaCO3) by titration with the HI3812 Total Hardness Chemical Test Kit.
- - Includes enough reagents for approximately 100 tests to be used with Hanna’s test kit.
- - Pre-made reagents for ease of use.
- - Prepared with high-purity chemicals.
- - Marked with expiration date and lot number for traceability.
Regular price
$55.57 AUD
+ GST
$61.13 AUD Inc. GST
$61.13 AUD Inc. GST
The HI3812-100 are high-quality reagents that are pre-measured, allowing users to achieve fast and accurate total hardness measurements with the chemical test kit. These reagents follow the EDTA titration method to determine total hardness concentration as calcium carbonate (CaCO3).
For determination of total hardness, the sample solution is first buffered to pH 10. The calmagite color indicator is added to form weak complexes at this basic pH with magnesium and calcium, forming a red colored complex. Addition of the EDTA titrant solution also forms complexes with the remaining free magnesium and calcium ions. Once all of the free magnesium and calcium ions have been complexed, the excess EDTA preferentially removes the ions bound with the calmagite color indicator, forming a stronger complex. The removal of these metal ions from the indicator causes a color change from red to blue, indicating the endpoint of the titration. The number of milliliters of titrant used to reach the appropriate endpoint will determine the total hardness as mg/L CaCO3. These reagents are designed to be used with samples that have an expected total hardness range of 0.0 to 30.0 mg/L and 0 to 300 mg/L CaCO3.
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