Hanna Instruments Australia
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Sales: (03) 9769 0666   |    Mon to Fri: 8:30am – 5:00pm
Hanna Instruments Australia
Sales: (03) 9769 0666   |    Mon to Fri: 8:30am – 5:00pm

Total Hardness Test Kit Replacement Reagents (100 tests) - HI3812-100

$61.13

SKU: HI3812-100

The HI3812-100 are reagents for the determination of total hardness (as CaCO3) by titration with the HI3812 Total Hardness Chemical Test Kit. There are enough reagents for approximately 100 tests to be used with Hanna’s test kit. These high quality reagents are manufactured in our state-of-the-art facility and are clearly marked with the lot number and expiration date on each packet for traceability.

  • Pre-made reagents for ease of use
  • Prepared with high-purity chemicals
  • Marked with expiration date and lot number for traceability

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.

SKU HI3812-100
Name Total Hardness Test Kit Replacement Reagents (100 tests) – HI3812-100
Package bottles
Quantity 100 tests
Method EDTA

Total Hardness Test Kit Replacement Reagents (100 tests) – HI3812-100

All prices are inclusive of GST and not all items are stock items, if you require an immediate solution please send an email to sales@hannainst.com.au or call us on (03) 9769 0666.


Free standard delivery:

We offer free delivery within Australia, typically arriving within 5 to 7 days. Delivery times may vary depending on the courier service and the recipient’s location.


Same-day express delivery:

Place your order before 1 PM Monday to Friday for the same-day express shipping. Delivery times may vary depending on the courier service and the recipient’s location.

Please note that we do not offer shipping to PO Box addresses.

All prices are inclusive of GST and not all items are stock items, if you require an immediate solution please send an email to sales@hannainst.com.au or call us on (03) 9769 0666.

Please note that we do not offer shipping to PO Box addresses.