Content Essay

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EXAM REVIEW GLASSWARE: Used for analytical work because of high resistance to corrosion and breakage Types of Glass: - Thermal Resistant Borosilicate glass: High thermal resistant glass is usually borosilicate glass with low alkali content Resistant to heat, corrosion, and thermal shock Should be used whenever heating or sterilization by heat Used widely in the Laboratory because of high resistance quality Beakers, flasks and pipettes made of borosilicate glass Mechanical strength, Thermal and chemical resistance well balanced - Alumina-Silicate Glass: High silica content makes it comparable to fused quartz in heat resistance, chemical stability and electrical characteristics Chemically strengthened NOT thermally High precision analytical work Radiation resistant Used for optical reflectors and mirrors Not found in laboratory - Acid-Resistant & Alkali-Resistant Glass Glass with high resistance to acids or alkali Use with strong acid or alkaline solutions Boron-free (soft glass) Thermal resistance much less than borosilicate glass Must be heated and cooled very carefully Limited use - Low-Actinic (Amber-colored) Glass: Low –actinic glassware contains materials that impart an amber or red color to the glass Reduces the amount of light transmitted through the substance Used for sensitive to light substances like bilirubin and vitamin A - Flint Glass: Standard flint or soda-lime glassware Composed of mixture of oxides of silicon calcium and sodium Most inexpensive glass Much less resistant to high temperatures and sudden changes in temp Resistance to chemical attack Made from soda-lime glass can release alkali into solutions and cause errors in the lab determinations Manual pipettes from soda lime glass may release alkali into pipette liquid Disposable Glassware: Reuced the need of cleaning glassware (use and

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