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24 Cards in this Set
- Front
- Back
- 3rd side (hint)
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conform to the standard set by the Reagent Chemical Committee of the ACS analytical work |
Reagent Grade |
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Extraordinary purity is required Carefully analyzed and the assay is printed on the container label. |
Primary-Standard Grade |
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Chemicals for specific application Includes solvents for spectrophotometry and high performance liquid chromatography. |
Special Purpose Reagent Chemicals |
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Rules for handling Reagents and Solution |
Select the best grade of chemical available for analytical work. Replace the top of every container immediately after removal of the reagent. Hold the stoppers of reagent bottles between your fingers, never set a stopper on a desktop. Never return any excess reagent to a bottle. Never insert spatulas, spoons, or knives into a bottle that contains a solid chemical. Keep the reagent shelf and the laboratory balance clean and neat. Observe local regulations concerning the disposal of surplus reagents and solutions. |
SaRaH NoN KO |
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Containing vessels must be: |
a. marked for positive identification of contents. b. cleaned before being used. c. Washed with deionized water |
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sudden, often violent boiling that tends to spatter solution out of its container. It causes partial loss of the solution. |
Bumping |
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max cap ranging between 160 and 200g |
Maceobalances |
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max load of 10 to 30g |
Semimicroanalytical Balance |
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capacity of 1-3 g |
Microanalytical Balance |
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The weight of the material is the difference between the two weights of the container before and after the material was transferred from the container |
Weighing by Difference |
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Looks like an analytical balance Less precise Has a tare button like the analytical balance |
Top Loading Balance |
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Materials for weighing |
•Weighing Boats •Weighing Dish •Aluminum Foils or Weighing Paper |
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Plastic for liquid or solid samples Anti static Facilitate controlled pour off |
Weighing Boats |
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aluminum or plastic For liquids or solids Ideal for controlled pour off, anti –statuc |
Weighing Dish |
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Moisture resistant and non-absorbent Must be used if samples must be stored for considerable periods of time |
Aluminum Foil or Weighing Paper |
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How to use the Analytical Balance |
Turn the balance on by pressing the keypanel. Place the weighing paper on the balancepan. Close the sliding doors Press the TARE button. Carefully add the substance to be weighedup to the desired mass. Before recording mass, close the glass doorsand wait until the stability detector is stable.Record mass. |
Tito PaCaPa Cung Big |
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Cautions in Using the Analytical Balance |
Center the load on the pan. Protect balance from corrosion. Observe proper precautions for the weighing of liquids. Consult the instructor if the balance needs adjustment. Keep the balance and its case scrupulously clean. Always allow an object that has been heated to return to room temperature before weighing it. Use tongs or finger pas to prevent the uptake of moisture by dried objects. |
CPOC KAU |
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Avoid putting droppers directly on table tops or surfaces of working area to avoid: |
•Contamination •Skin Iritation •Damage to property and equipment |
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1ml is approximately how many drops in a non graduated dropper |
20 |
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Solid to semi-solid particles formed at the bottom of the test tube after combining two reactive solutions |
Precipitates |
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To separate precipitate from supernatant the mixture undergoes |
Centrifugation |
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speeds up separation of precipitate from supernatant using the action of gravity |
Centrifuge |
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Separation of supernatant and precipitate after centrifugation can be done by: |
•Capillary Pipet •Decantation |
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Ensures complete homogeneity after reagent addition |
Vortex Mixer |
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