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Chemistry Lab Equipment
Basic Chemistry Lab Techniques
 
Each group has equipment available at lab stations and on lab trays.
Additional equipment is available, if requested by your group before the lab.

You should know the name of each piece and its basic use.

 

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

pipets

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

one type of pipet filler

Used in conjunction with a vacuum connection to a water faucet to speed up filtration. filter flask

flask

The Erlenmeyer flask is the most common flask in the chemistry lab. It is used to contain reaction solutions. Erlenmeyer flask

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

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

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

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

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

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

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

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

stirring rod

When attached to the ring stand, this iron ring is used to support glassware above the lab table.     support ring

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

utility clamp

A ring stand is used with either Support Ring or Utility Clamp to HOLD equipment. ring stand

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

clay triangle

Crucibles are used as a container when something requires "strong" heating. crucible & cover

crucible and cover

These tongs are used for picking up crucibles and crucible covers only.     crucible tongs

crucible tongs

Used as a support for beakers and other glassware when placed across a support ring.     wire gauze

wire gauze

Used to light a lab burner. Not a toy noisemaker during lab.         striker

striker

Used to grind solids into powers. mortar & pestle

mortar and pestle

Used to hold test tubes for short periods of "gentle" heating.

test tube holder

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

filter funnel

Used for rinsing solids out of a container when filtering - or whenever a small amount of distilled water is needed. wash bottle

wash bottle

Used to transfer solids from their original storage container. chemical spoon

chemical spoons

Used to close hoses by pinching them together. hose clamps

rubber 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

desiccator

 

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Jim Askew  

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