W1 lab glassware

Question 1

accuracy of glassware

Answer 1

This refers to limits of error or the nearness to the true value ex: limit of error of a 5ml volumetric pipette is 0.005ml the pipette would deliver a volume between 4.995 and 5.005

Question 2

precision

Answer 2

how accurate the pipette is

Question 3

reproducibility

Answer 3

How many times the pipette can produce the same results

Question 4

temperature

Answer 4

temp that glassware was calibrated ad is supposed to be used at. its usually 20 liquids must reach room temp before being meassured because they expand and contract
high temp liquids take up more space
low temp liquids take up less space

Question 5

tc

Answer 5

to contain
calibrated to hold the stated volume
when liquid drained, less than the stated volume will be delivered

Question 6

td

Answer 6

to deliver

when liquid is drained from container the exact volume will be delivered

Question 7

meniscus

Answer 7

surface tension causes a curve, read bottom of curve at eye level

Question 8

volumetric flask

Answer 8

preparation of accurate solutions, calibrated 20 and tc

Question 9

cylinders

Answer 9

less accurate then volumetric flask prepare solution that do not require a degree of high accuracy

Question 10

containers

Answer 10

not calibrated to deliver exact volumes
beakers-hold reagents or water
erlenmeyer flask- containers used during prep
test tube-glass plastic plain centrifuge or reusable
reagent bottle- glass plastic clear or amber

Question 11

volumetric pipette

Answer 11

calibrated td a single volume

used to make accurate measurements of aqueous fluids such a s controls or standards