Laboratory Glasswares and Plasticwares Flashcards
(106 cards)
1
Q
Identify whether it is a glassware or a plasticware:
reusable
A
glassware
2
Q
Identify whether it is a glassware or a plasticware:
disposable
A
plasticware
3
Q
Identify whether it is a glassware or a plasticware:
highly shock proof
A
plasticware
4
Q
Identify whether it is a glassware or a plasticware:
breakable
A
glassware
5
Q
Identify whether it is a glassware or a plasticware:
ideal for acidic solutions
A
glassware
6
Q
Identify whether it is a glassware or a plasticware:
high thermal and corrosion resistance
A
glassware
7
Q
Identify whether it is a glassware or a plasticware:
ideal for alkaline solutions
A
plasticware
8
Q
Identify whether it is a glassware or a plasticware:
relatively inert
A
plasticware
9
Q
Identify whether it is a glassware or a plasticware:
good optical properties
A
glassware
10
Q
Identify whether it is a glassware or a plasticware:
flexible
A
plasticware
11
Q
Identify whether it is a glassware or a plasticware:
low cost
A
glassware
12
Q
Identify whether it is a glassware or a plasticware:
for cryogenic experiments
A
plasticware
13
Q
Enumerate all the types of glasswares
A
- high thermal resistant glass
- high silica glass
- glass with high resistance to alkalis
- low actinic glass
- standard flint glass
14
Q
Enumerate all the types of plasticwares
A
- polyolefins: polyethylene, polypropylene
- polycarbonate resin
- Tygon
- Teflon fluorocarbon resins
Chemical resistance part
- polystyrene
- polyethylene
- polypropylene
- Teflon
- polycarbonate
15
Q
Aside from the mentioned glasswares, cite other lab glasswares.
A
- buret or biuret
2. cuvette
16
Q
Enumerate other lab glass vessels
A
- volumetric flask
- graduated cylinders
- Erlenmeyer flask and griffin beaker
17
Q
what type of material is a high thermal resistant glass?
A
borosilicate glass with low alkali content
18
Q
what glassware resists heat, corrosion, and thermal shock?
A
high thermal
resistant glass
19
Q
what are the most common high thermal resistant glass?
A
- pyrex
- Klimax
- Exax
20
Q
6x stronger than borosilicate
glass
A
corex
21
Q
Corex is a type of high thermal resistant glass and it is also known as…
A
alumina-silicate glass
22
Q
Type of high thermal resistant glass that is able to resist clouding due to alkali or scratching
A
corex
23
Q
Type of high thermal resistant glass that is ideal for higher temperature thermometers, graduated cylinders, and centrifuge tubes
A
corex
24
Q
Type of high thermal resistant glass that is recommended for use in application involving high temperature and drastic heat shock and extreme chemical treatment with acids and dilute alkali
A
Vycor
25
Type of high thermal resistant glass that is ideal for ashing and ignition techniques
vycor
26
Vycor is heatable to ___C and withstand down shock from ____C to ___ water
900C; 900C to ice water
27
it has a 96% silica content comparable to fuse quartz in its thermal endurance, chemical stability, and electrical characteristics
high silica glass
28
high silica glass has a __% silica content
96%
29
it is radiation resistant, good optical qualities, and temperature capabilities
high silica glass
30
ideal for high precision analytical work and can
| also be used for optical reflectors and mirrors
high silica glass
31
known as the soft glass
glass with high resistance to alkalis
32
boron-free glassware for strong alkali solution
| and digestion with strong alkalis
glass with high
resistance to
alkalis
33
glass with high
resistance to
alkalis is a ___-free glassware
boron-free glassware
34
it has a less thermal resistant than borosilicate glass
glass with high
resistance to
alkalis
35
this glassware is amber-colored
low-actinic glass
36
why is the low-actinic glass amber colored?
```
- to reduce the amount of light
passing through the substance within the
glassware
- To avoid
exposing to light which will lead to degradation,
hence, leading to false results
```
37
highly protective laboratory glassware for
handling heat-labile substances in the 300-
500nm range (bilirubin, carotene, and Vit. A)
low actinic glass
38
heat-labile substances that low actinic glass handle
bilirubin
carotene
Vit. A
39
standard flint glass is also known as
soda lime glass
40
Standard flint glass is composed of a mixture of oxides: __, __, and __
Si, Ca and Na
41
lowest in cost readily fabricated
standard flint glass
42
poorly resistant to high temperature and sudden
| changes in temperature
standard flint glass
43
easy to melt and shape thus used as reagent
| bottles and disposable laboratory glassware
standard flint glass
44
release alkali into the pipetted liquid
standard flint glass
45
beginning to replace glassware in the lab
plasticware
46
unique high resistance to corrosion and
| breakage as well as its varying flexibility
plasticware
47
relatively inexpensive
▪ allowing most items to be completely
disposable after its use
plasticware
48
polyethylene and polypropylene falls under the group of
polyolefins
49
unique group of resins with relatively inert
| chemical properties
polyolefins
50
polyolefins is unaffected by:
- acids (howv, conc. sulfuric acid slowly attacks polyethylene at room temp)
- alkalis
- salt solutions
- most aqueous soln
51
Hydrocarbons that can cause moderate swelling at RT of polyolefins
- aromatic
- aliphatic
- chlorinated
52
Substances that can slowly penetrate polyolefins plastics?
- organic acids
- essential oils
- halogens
53
strong oxidizing agents attack this group at
| elevated temperatures only
polyolefins
54
what agents attack polyolefins at an elevated temperature only?
strong oxidizing agents
55
At what temp does strong oxidizing agents attack polyolefins?
elevated temp only
56
which is more expensive, polypropylene or polyethylene?
polypropylene
57
sterilizable however, it absorbs pigment and tend to become discolored
polypropylene
58
twice as strong as polypropylene (from -100C to +160C)
polycarbonate resin
59
can endure thermal shock
polycarbonate resin
60
chemical resistance is not as wide as the
| polyolefin
polycarbonate resin
61
unsuitable for use with bases as amines,
ammonia, and alkalis as well as oxidizing
agents
polycarbonate resin
62
polycarbonate resin is unsuitable for use with?
- bases: amines, ammonia and alkalis
| - oxidizing agent
63
glass-clear and shatter proof
polycarbonate resin
64
ideal for centrifuge tubes & graduated cylinders
polycarbonate resin
65
why is polycarbonate resin ideal for centrifuge tubes & graduated cylinders?
because it is glass clear and shatter proof
66
non-toxic, clear plastic of modified PVC
tygon
67
meaning of PVC
polyvinylchloride
68
flexible and used to handle most chemicals
tygon
69
tubing is soft and flexible and quickly slips over
tabulatures but gripping tightly on glass or
metals
tygon
70
almost chemically inert with high corrosion
| resistance at extreme temperatures
Teflon fluorocarbon resins
71
for cryogenic experiments and work at high
| temperatures over extended periods
Teflon fluorocarbon resins
72
pure translucent white and inert
Teflon fluorocarbon resins
73
easy to clean and fast drying but it can be
| scratched and misshaped
Teflon fluorocarbon resins
74
type of plastic that is useful with water and aqueous salt solutions?
polystyrene
75
polystyrene is not recommended for use with?
- acids
- aldehydes
- ketones
- ethers
- hydrocarbons
- essential oils
76
In polystyrene plastic, alcohols and bases can be used, but storage beyond __hrs is discouraged
24 hrs
77
alcohols and bases can be used, but storage
| beyond 24 hours is discouraged
polystyrene
78
what are the classifications of polyethylene?
conventional and linear
79
conventional and linear polyethylene have different chemical resistances
False; similar chemical resistances
80
both classifications of polyethylene (i.e.,
conventional and linear) have similar chemical
resistances: they have excellent chemical
resistance to most substances, with the
exception of:
```
▪ aldehydes
▪ amines
▪ ethers
▪ hydrocarbons
▪ essential oils
```
81
For ________ polyethylene, the exceptions
should also include:
▪ lubricating oil
▪ silicones
conventional polyethylene
82
conventional polyethylene is not chemical resistant to?
```
▪ aldehydes
▪ amines
▪ ethers
▪ hydrocarbons
▪ essential oils
▪ lubricating oil
▪ silicones
```
83
the usage of any of the above-named chemical
groups in polyethylene should be limited to __ hours at ___
temperature
24 hrs; room temp
84
has the same chemical resistance as linear
| polyethylene
polypropylene
85
this resin possesses excellent chemical resistance
| to almost all chemicals used in the clinical lab
teflon
86
very susceptible to damage by most chemicals
polycarbonate
87
for a long period of time, polycarbonate is resistant to?
water
aqueous salts
food
inorganic acids
88
Resistance to chemicals decreases as?
the temperature of the resin nears its maximum
89
Chemical resistance will also vary as the?
concentration of the chemical increases
90
is calibrated to hold one exact volume of
| liquid (TC)
volumetric flask
91
are long cylindrical tubes usually help
| upright by an octagonal or circular base
graduated cylinders
92
designed to hold different volumes rather
| than one exact amount
Erlenmeyer flask and griffin beaker
93
used for titration and for dispensing aliquots
| of a solution
buret or biuret
94
high-silica glassware
cuvette
95
used to hold solutions for optical reading of
| absorbance
cuvette
96
what are the two types of cuvette?
- round cuvette
| - square cuvette
97
how do you clean glassware and plasticware?
1. glass or plastic that is in direct contact with hazardous material
is usually disposable, otherwise, it must be decontaminated
(special techniques may be required for certain situations)
2. pre-soaking glassware in soapy water
3. visual inspection should reveal spotless vessel walls
4. some applications may require plastic rather than glass because
glass can absorb metal ions
98
in what instances during cleaning that some applications may require plastic rather than glass?
glass can absorb metal ions
99
How to wash glasswares?
1. Wash in tap water to remove gross dirt
2. Soak in suitable detergent for a few minutes
3. Soak in running tap water until no trace detergent is left. 3 times
4. Rinse with distilled water to remove any contaminants present in the detergent
5. Dry in an oven at temperature less than 140C
100
How to wash glassware with blood clots?
10% Sodium Hydroxide
| Soak for 12-24 hours, then follow routine procedure. Dry micropipettes using an acetone rinse
101
How to wash new pipettes (SI alkaline)
Rinse with 5% hydrochloric acid or 5% nitric acid. Wash following routine procedure
102
How to wash glassware with metal ion determination?
Acid soak (20% nitric acid) for 12-24 hrs. Rinse with distilled water 3-4 times. Water should be fresh for each rinsing step. Dry
103
How to wash glassware with grease?
1. Soak in any organic solvent
2. Dissolve 100g potassium hydroxide in 100 mL distilled water. Allow to cool. Add 900 mL commercial-grade
10% ethanol. ❗❗ Not to be used for delicate glassware. ❗❗
3. Contrad 70 (manufactured by Harleco)
104
How to wash glasswares with permanganate stains?
1. 50% hydrochloric acid. Rinse with tap water. Wash.
| 2. Dissolve 1% ferrous sulfate in 25% sulfuric acid.
105
How to wash bacteriologic glassware?
Soak in 2% to 4% cresol solution followed by autoclaving and thorough washing
106
how to wash glasswares with iron determination?
Soak in 1:2 dilution of concentrated HCl solution or 1:3 dilution of concentrated HNO3.
