Customized glass instrument processing

Name

main purpose

Precautions

beaker

Prepare solutions, dissolve samples, etc

When heating, it should be placed on an asbestos mesh to ensure even heating, and generally should not be burned dry

Erlenmeyer flask

Heating treatment of samples and volumetric analysis titration

Except for the same requirements as above, the stopper should be opened when heating the conical flask with a grinding mouth, and the original stopper should be kept for non-standard grinding mouths

Iodine flask

Quantitative analysis of volatile substances generated by iodometric method or other methods

Ditto.

Round (flat) bottom flask

Heating and distilling liquids

Generally avoid direct heating, use asbestos mesh or various heating baths for heating

Round bottom distillation flask

Distillation; It can also be used as a reactor for generating small amounts of gas

Ditto.

Kjeldahl flask

Dissolve organic matter

Heat the asbestos net, do not face yourself or others in the direction of the bottle mouth

bottle washing

Install purified water washing equipment or wash sediment with washing solution

Measuring cylinder, measuring cup

Roughly measure a certain volume of liquid for

Cannot be heated, cannot be used to prepare solutions, cannot be baked in an oven, and the solution must be added or poured along the wall during operation

Measuring bottle

Prepare accurate volume standard solution or test solution

Non standard grinding plugs should be kept in their original configuration; Water leaking cannot be used; Cannot be baked in an oven, cannot be heated directly, can be heated in a water bath

Burette (25 50 100ml)

Capacity analysis titration operation; Divided into acidic and basic forms

The piston should be original; Leaking water cannot be used; Cannot be heated; Cannot store alkaline solution for a long time; Alkaline tubes cannot hold titrants that interact with rubber

Micro burette

1 2 3 4 5 10ml

Trace or semi trace analysis titration operation

Only piston type; Other precautions are the same as above

Automatic burette

Automatic titration; Can be used for operations that require air isolation in titrants

In addition to meeting the same requirements as regular burettes, it is important to store them as a complete set. Additionally, double connected balls should be used for inflation

pipette

Accurately remove a certain amount of liquid

Cannot be heated; The upper end must not be broken

graduated pipette

Accurately transfer various amounts of liquid

Ditto.

weighing bottle

Dwarf shape is used to determine drying loss or as a reference material for drying in an oven; High profile is used for weighing reference materials and samples

Do not cover tightly and bake the grinding plug. The grinding plug should be original

Reagent bottles: fine mouthed bottles, wide mouthed bottles, bottom mouthed bottles

Fine mouthed bottles are used to store liquid reagents; Wide mouthed bottles are used to hold solid reagents; Brown bottles are used to store reagents that are easily decomposed by light

Cannot be heated; It is not allowed to prepare a solution that releases a large amount of heat during operation in the bottle; The grinding plug should be kept in its original configuration; The bottle containing alkaline solution should be sealed with a rubber stopper to prevent it from not opening over time

Drip bottle

Reagents to be added dropwise

Ditto.

funnel

The long necked funnel is used for quantitative analysis and filtration of sediment; Short neck funnel used for general filtration

Separating funnel: droplet spherical pear shaped cylindrical shape

Separate two immiscible liquids; Used for extraction, separation, and enrichment (often pear shaped); Add liquid in the preparation reaction (often using spherical and dropping funnels)

The grinding plug must be original, and a leaking funnel cannot be used.

Test tube: ordinary test tube, centrifuge test tube

Qualitative analysis to test ions; Centrifugal test tubes can separate solutions and precipitates through centrifugal action in a centrifuge

Test tubes made of hard glass can be heated directly on a flame, but cannot be cooled; Centrifugal tubes can only be heated in a water bath

Nessler's colorimetric tube

Colorimetric and turbidimetric analysis

Do not heat directly; Non standard grinding plugs must be original; Pay attention to keeping the pipe wall transparent and do not use decontamination, painting, or washing

Condenser tube: straight spherical serpentine air condenser tube

Used for cooling distilled liquids, serpentine tubes are suitable for condensing low boiling point liquid vapors, and air condenser tubes are used for condensing liquid vapors with boiling points above 150 ℃

Do not gather cold or heat; Pay attention to entering cooling water from the bottom and exiting from the top

Filter bottle

Accept filtrate during filtration

Belonging to thick walled containers, capable of withstanding negative pressure; Not heatable

Surface dish

Cover beakers and funnels, etc

Do not heat directly, the diameter should be slightly larger than the container being covered

mortar

Grinding solid reagents and samples, etc; Substances that cannot be ground and interact with glass

Cannot collide; Cannot bake

dryer

Keep dried or burnt substances dry; It can also dry products prepared in small quantities

Place color changing silicone or other desiccants at the bottom, and apply an appropriate amount of Vaseline to the grinding mouth of the cover; Do not put red hot objects in. After placing hot objects, always open the lid to prevent it from jumping or not being able to open after cooling

Vertical melting glass funnel

filter

It must be filtered; Cannot gather cold and heat; Cannot filterHFAcid, alkali, etc; Wash immediately after use

Vertical melting glass crucible

Sediments to be weighed during drying in weight analysis

Ditto.

Standard grinding mouth combination instrument

Preparation and Separation in Organic Chemistry and Organic Semitrace Analysis

Do not apply lubricant to the grinding area; Do not be subjected to skewed pressure during installation; Purchase according to the required equipment