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Calcium Sulphate Dihydrate Extra Pure

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Calcium Sulphate Dihydrate Extra Pure is a high-purity, white crystalline compound commonly used in laboratory settings for controlled experiments involving hydration and crystallization. Also known as gypsum, it serves as a reliable source of calcium and sulfate ions in analytical chemistry and is often used in preparing culture media, setting-time studies, and thermogravimetric analysis. Its stable dihydrate form makes it ideal for demonstrating water crystallization and thermal decomposition when converted to hemihydrate or anhydrous forms. The extra pure grade guarantees minimal impurities, ensuring accuracy in sensitive applications. It should be stored in a cool, dry place to maintain its hydration state and analytical integrity.

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Categories: Analytical Reagents, Inorganic and Organic Standards Tags: AnalyticalGrade, CalciumSulphate, CaSO4·2H2O, Gypsum, HydratedSalt, SolubilityStudies, SpecialtyLabReagent, ThermalAnalysis

Description

Table of Contents

Calcium Sulphate Dihydrate Extra Pure

Primary Uses

Standard for Quantitative Analysis
- Used as a primary standard in gravimetric and sulfate precipitation experiments due to its known composition and stability.
Casting & Molding Medium
- Commonly utilized in preparation of molds and casts for biological specimens, fossils, or impressions during demonstrations and teaching.
Reagent in Chemical Synthesis
- Employed as a source of calcium ions in the preparation of other calcium salts under mild aqueous conditions.
Study of Crystallization Processes
- Used in crystallography and recrystallization demonstrations, especially to illustrate water of crystallization concepts.
Educational Demonstrations of Hydration/Dehydration
- Heated to form calcium sulfate hemihydrate or anhydrous form, demonstrating reversible hydration processes.

Secondary Uses

pH Buffer Component
- Occasionally used in combination with other salts to stabilize pH in controlled systems.
Soil Chemistry Simulations
- Incorporated in agricultural lab tests to mimic gypsum effects in soil leaching or remediation studies.
Substrate for Microbial Growth Studies
- Added to certain growth media to study calcium ion effects on microorganisms (less common).
Thermal Behavior Studies
- Included in thermal gravimetric analysis (TGA) to assess water loss upon heating and phase change behavior.

Additional information

PACK SIZE	500 grams Plastic Tin

KEY PRODUCT FEATURES

1. Basic Identification Attributes

Chemical Name: Calcium Sulphate Dihydrate
Chemical Formula: CaSO₄·2H₂O
CAS Number: 10101-41-4
HS Code: 2833.29.90
Grade: Extra Pure (Laboratory Grade)
Synonyms: Gypsum, Hydrated calcium sulfate, Terrestrial gypsum

2. Physical & Chemical Properties

Appearance: White crystalline powder
Odor: Odorless
Molar Mass: 172.17 g/mol
Solubility in Water: Slightly soluble (~0.24 g/100 mL at 25°C)
Density: ~2.32 g/cm³
Melting Point: Decomposes before melting (~1450 °C)
pH (saturated solution): ~6–7

3. Safety & Hazard Attributes

GHS Classification:
- Not classified as hazardous under GHS for lab-scale use
GHS Pictograms: None required
Hazard Statements:
- May cause mild irritation to eyes or respiratory tract if inhaled as dust
Precautionary Statements:
- Avoid generating dust
- Use appropriate PPE when handling in powdered form

4. Storage & Handling Attributes

Storage Conditions:
- Store in a cool, dry place
- Keep container tightly closed
- Protect from moisture (to avoid caking or premature dehydration)
Packaging: Plastic jars or poly-lined containers for laboratory use
Handling Precautions:
- Use dust masks and eye protection
- Avoid inhalation or prolonged contact with skin

5. Regulatory & Compliance Attributes

Transport Classification:
- Not regulated as a hazardous material
Disposal Considerations:
- Dispose of according to local environmental regulations
- Can typically be discarded with regular laboratory waste if uncontaminated

6. Environmental & Health Impact

Toxicity:
- Low toxicity; considered safe in small quantities
Ecotoxicity:
- Not known to be environmentally hazardous
Biodegradability: Not applicable — inorganic salt
Fumes/Dusts:
- Inhalation of fine particulate can be mildly irritating

SAFETY HANDLING PRECAUTIONS

SAFETY PRECAUTIONS

Personal Protective Equipment (PPE):
- Wear safety goggles, lab coat, dust mask or respirator (if airborne particles are present), and gloves.
Handling:
- Avoid generating dust.
- Use only with adequate ventilation or under a fume hood.
- Wash hands thoroughly after handling.
Storage:
- Store in a cool, dry, and well-ventilated area.
- Keep container tightly closed when not in use.
- Protect from moisture to avoid clumping or caking.

FIRST AID MEASURES

Inhalation:
- Move person to fresh air.
- Seek medical advice if respiratory symptoms develop.
Skin Contact:
- Wash thoroughly with soap and water.
- Remove contaminated clothing.
- If irritation occurs, get medical advice.
Eye Contact:
- Rinse cautiously with plenty of water for at least 15 minutes.
- Remove contact lenses if present and easy to do.
- Seek medical attention if irritation persists.
Ingestion:
- Rinse mouth with water.
- Drink water to dilute.
- Not expected to be toxic, but seek medical attention if symptoms occur.

FIRE FIGHTING MEASURES

Flammability:
- Non-flammable.
Extinguishing Media:
- Use water spray, foam, dry chemical, or CO₂ — appropriate for surrounding fire.
Hazardous Combustion Products:
- May emit sulfur oxides when heated to decomposition.
Firefighter Protection:
- Wear SCBA and full protective gear if involved in fire conditions.