
H-3 Hardness (Total) Indicator
H-3 Hardness (Total) Indicator is a prepared indicator solution, typically based on Eriochrome Black T (EBT), used in complexometric titrations for determining total water hardness. It forms a distinct wine-red complex with calcium and magnesium ions, which changes to blue at the titration endpoint with EDTA.
Appearance
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Dark-colored liquid (usually deep blue-violet to reddish, depending on formulation)

Uses
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Water hardness determination: visual endpoint detection in EDTA titrations
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Laboratory analysis of natural, industrial, and treated water
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Field testing when used with H-1 Hardness Titrant and H-2 Buffer
Key Features
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Ready-to-use solution for quick and accurate titrations
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Provides sharp color change at the endpoint (wine-red → blue)
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Reliable in both field kits and laboratory setups
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Completes the standard hardness test system (with titrant and buffer)
SDS (Safety Data Highlights)
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Hazards: May cause staining, skin and eye irritation; harmful if swallowed
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Precautions: Use gloves, goggles, and protective clothing; avoid inhalation or ingestion
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Storage: Store tightly closed in a cool, dark place away from oxidizers
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First Aid:
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Eyes: Rinse immediately with water
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Skin: Wash with soap and water
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Ingestion: Rinse mouth and seek medical help
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Q & A
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