|
For exact volume measurements of liquids. Pipet on the left is a Volumetric pipet. It has only one graduation for delivering one exact volume. Pipet on the right is a Mohr pipet. It has graduations for delivering any number of exact volumes. |
pipet 
|
There are several styles of fillers available to draw liquids into a pipet.
Use of the standard pipet bulb is described on the lab techniques page.
Never draw a liquid into a pipet with your mouth. |
pipet filler 
|
|
Used in conjunction with a vacuum connection to a water faucet to speed up filtration. |
filter flask 
|
The Erlenmeyer flask is the most common flask in the chemistry lab. It is used to contain reaction solutions. |
Erlenmeyer flask 
|
|
The rounded bottom of the florence flask makes it ideal for boiling liquids. It also makes this flask easy to tip over when sitting on the lab table. |
Florence flask 
|
The volumetric flask is used to make solutions. It has a precise graduation line in the neck of the flask. A solute is placed into the flask, then the solvent is used to bring the total volume up to the graduation. |
volumetric flask 
|
|
Beakers are the most versatile glassware in the lab and can be used for just about anything. The volume graduations on beakers should be used only for "ballpark" estimates. |
beaker 
|
Used for accurate measurements of liquid volumes.
The bumper ring on cylinders is NOT for measuring. It is to prevent breakage if tipped over. Keep it near the top. |
graduated cylinder 
|
|
This dish is used to recover dissolved solids by evaporation.
It is made for heating, but should not be used for "strong" heating. |
evaporating dish 
|
A watch glass can be used like an evaporating dish for very small amounts of liquid. It can also be used to cover beakers. |
watch glass 
|
|
A glass stirring rod is used to "mix" things in a liquid solution.
Hint: NEVER stir a liquid with a thermometer!
|
stirring rod
|
A laboratory thermometer is used to measure the temperature of a substance.
Hint: When measuring the temperature of a liquid while heating, always measure the center of mass of the liquid.
|
thermometer
|
|
When attached to the ring stand, this iron ring is used to support glassware above the lab table. |
support ring 
|
When attached to the ring stand, this clamp is used to hold a large test tube or Florance flask above the lab table. |
utility clamp 
|
|
A ring stand is used with either Support Ring or Utility Clamp to HOLD equipment.
|
ring stand
|
The primary purpose of a clay triangle is to hold a crucible during heating. Lay the clay triangle across a support ring attached to a ring stand. The clay triangle will hold the crucible centered over the burner flame.
It can also support a funnel during filtering.
|
clay triangle
|
|
Crucibles are used as a container when something requires "strong" heating. |
crucible & cover 
|
These tongs are used for picking up crucibles and crucible covers only. |
crucible tongs 
|
|
Used as a support for beakers and other glassware when placed across a support ring. |
wire gauze 
|
Used to light a lab burner. Not a toy noisemaker during lab. |
striker 
|
|
Used to grind solids into powers. |
mortar & pestle 
|
Used to hold test tubes for short periods of "gentle" heating. |
test tube holder 
|
|
When lined with filter paper, used to filter suspended solids from a liquid.
DO NOT use a filter funnel to transfer liquids from one container to another. |
filter funnel 
|
Used for rinsing solids out of a container when filtering - or whenever a small amount of distilled water is needed. |
wash bottle 
|
|
Used to transfer solids from their original storage container. |
chemical spoon 
|
Used to close hoses by pinching them together. |
hose clamps 
|
|
Dessicators are used to provide a dry environment for a crucible or substance to cool down. This is critical in quantitative work where moisture can affect mass results.
A common dessicant is anhydrous calcium chloride. Colored indicator crystals are often included to tell the user the condition of the dessicant. A gray color in the crystals usually indicates that the dessicant is dry and will absorb moisture. A pink color usually means that the dessicant is "hydrated". When this happens, the water can be removed by heating the dessicant in an oven.
|
desiccator
|