Hardness Indicator Du Bois #620
Hardness Indicator Du Bois #620 is a specialized reagent used in the determination of water hardness. It is employed as an endpoint indicator in complexometric titrations with EDTA, signaling the presence of calcium and magnesium ions through a distinct color change.
Chemical Name:
Water Hardness Indicator (Du Bois Formulation, typically Eriochrome Black T-based)
Synonyms:
Du Bois Hardness Indicator #620, Water Hardness Titration Indicator, Calcium/Magnesium Endpoint Indicator, EDTA Titration Indicator
CAS Number:
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Eriochrome Black T (common indicator component): 1460-53-1
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Water or buffer components: 7732-18-5
Appearance:
Dark red to purple solution

Key Properties:
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Produces a clear color change at the endpoint of hardness titrations
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Forms colored complexes with calcium and magnesium ions
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Compatible with standard EDTA titration methods
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Stable under normal laboratory conditions
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Provides reproducible and accurate detection of total hardness
Uses:
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Endpoint indicator for water hardness determination
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Laboratory quality control in water testing
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Environmental and industrial water monitoring
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Educational and teaching laboratories for titration experiments
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Ensures accurate determination of calcium and magnesium concentrations
Storage:
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Store in a cool, dry place
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Keep container tightly closed
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Protect from contamination and direct sunlight
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Avoid heat and strong oxidizing agents
Safety & Handling (SDS Summary):
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May cause mild skin or eye irritation
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Avoid ingestion and inhalation
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Use gloves, goggles, and standard laboratory PPE
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Wash hands thoroughly after handling
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In case of contact, rinse with plenty of water
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Low hazard under normal laboratory use
| Weight | 1 kg |
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