VOLUME MEASUREMENTS

Question 1

are used for measuring
small volumes of liquid.

Answer 1

Pipets

Question 2

TD

Answer 2

to deliver

Question 3

This indicates that the
measurement of this
graduate will compensate
for the excess liquid that
adheres to the surface of
the graduate after
emptying.

Answer 3

“TD” - “to deliver”

Question 4

TC

Answer 4

to contain

Question 5

This indicates an accurate measurement of
volume but pouring into another container
will not necessarily deliver the indicated
volume.

Answer 5

“TC” - “to contain”

Question 6

Reading must be done
at eye level To prevent

Answer 6

parallax error

Question 7

convex meniscus is for

Answer 7

colored

Question 8

concave meniscus is for

Answer 8

clear

Question 9

The mark at the bottom
of the meniscus for

Answer 9

colorless liquids

Question 10

At the top of the
meniscus for

Answer 10

colored
liquids

Question 11

Analytical procedures require

Answer 11

accuracy and precision

Question 12

Using at all times glasswares that are

Answer 12

clean

Question 13

All _____ glassware that is used in
precise measuring of liquids should
have fully _____.

Answer 13

class A

wettable surfaces

Question 14

Good cleaning practices should also be
accompanied by good _____ of the glass
surfaces for chips, cracks, or abrasions which
will cause mechanical failure.

Answer 14

inspection

Question 15

Cleaning the burette

Make sure the _____ is in
close position

Answer 15

stopcock

Question 16

Add a few milliliters of
_____, then tip
and roll the burette to allow
the detergent solution to
have contact with all the
inner surfaces

Answer 16

detergent solution

Question 17

Open the stopcock and
allow the detergent
solution to _____.

Answer 17

drain

Question 18

Repeat step 1 using
tap water to rinse off
the detergent
solution, then wash
_____ with
distilled water

Answer 18

three times

Question 19

After draining the distilled
water, close the stopcock
and add about ____ of the
solution to be dispensed
from the burette

Answer 19

5 mL

Question 20

MICROPIPETTE Procedures

Answer 20

1. Place a fresh tip securely
   on the barrel, carefully
   avoiding direct contact
   with the tip
2. Set the knob at the top
   of the pipet to the
   desired volume.
3. Depress the plunger to
   the first stop to dispense
   the selected volume.
4. Hold the pipet in an
   upright position,
   immerse it 3-5mm into
   the reagent solution,
   and slowly release the
   plunger to suck up
   liquid.
5. Withdraw the pipet tip
   from the liquid by sliding
   it along the container wall
   to remove liquid from the
   outside of the tip.
6. Lean the micropipette tip to the wall of
   the receiver and gently depress the
   plunger to the first stop to dispense the
   liquid.
7. Allow the liquid to drain along the wall of
   the pipette tip, then depress the plunger
   farther to squirt out the last liquid.
8. Discard the tip.

Question 21

Used for transferring liquid to another
container or to transfer a small amount of
reagent for use in procedures.

Answer 21

Beaker

Question 22

They are generally
more accurate and
precise for this
purpose than flasks.

Answer 22

Graduated Cylinder

Question 23

This is a semi-
accurate liquid
measuring vessels

Answer 23

Graduated Cylinder

Question 24

Used for measuring
small volumes of
liquid

Answer 24

Pipettes

Question 25

This will dispense
that exact volume
indicated

Answer 25

TD Pipette

Question 26

This holds or contains a particular volume
but does not dispense that exact volume.

Answer 26

TC Pipette

Question 27

This has a continuous etched ring, or two
small, close continuous rings located near
the top of the pipet

Answer 27

Blowout Pipette

Question 28

• To contain or deliver
  specific volumes of liquid
  sample
• Used in preparing
  solutions of accurately
  known concentrations

Answer 28

Volumetric Flask

Question 29

are not
used for storage of
solutions

Answer 29

Volumetric Flask

Question 30

A long, narrow tube
with a stopcock at its
base.

Answer 30

Burette

Question 31

It is used for accurately
dispensing flexible
volumes of liquids or
solutions.

Answer 31

Burette

Question 32

The procedure
of adjusting or
standardizing
equipment
before use.

Answer 32

Calibration