Instrumentation (P) Flashcards
What are the characteristics of Soda-lime or Float glass?
Consumer-grade or disposable
Can Soda-lime or Float glass crack under rapid heating?
Yes, cracks under rapid heating can occur
Is Soda-lime or Float glass easy to melt?
Yes, it is easy to melt
What is the characteristic of Borosilicate glass?
Thermally robust
What are the trade names of Borosilicate glass?
Pyrex and kimax
What is the strain point of Borosilicate glass?
550 degrees C
What is Fused silica or quartz?
Chemically-pure silicon dioxide with no impurities and a very high melting point
What is the melting point of Fused silica or quartz?
A very high melting point above 1,600 degrees C
What are the different types of glasswares?
1) Beakers
2) Erlenmeyer flasks
3) Test tubes
4) Volumetric flasks
What is the purpose of beakers?
For mixing and transferring of liquids
What are the characteristics of beakers?
1) Flat bottom
2) Wide-mouthed
What is the minimal percent error of beakers?
10%
What is the function of erlenmeyer flasks?
Good for swirling, storing, and heating liquids
What are the characteristics of erlenmeyer flasks?
1) Has a narrow neck and a flat bottom
2) Easy to cover
What is the minimal percent error of erlenmeyer flasks?
10%
What is the function of test tubes?
To collect and hold small samples
What are the characteristics of test tubes?
1) Inexpensive
2) Made up of glass or plastic
Can test tubes carry precise volumes?
No, test tubes carry imprecise volumes
What is the function of volumetric flasks?
Used to prepare solutions
What are the characteristics of volumetric flasks?
1) It has a narrow neck with markings for single precise volume
2) Not meant for heating
3) Can be stoppered or sealed
What is the minimal percent error of volumetric flasks?
0.3%
What is the use of pipettors?
Used to deliver small volumes of liquids reliably and repeatedly
Can pipettors withstand exposure to extreme temperatures?
No
What is the percentage of accuracy of (automatic) pipettors?
90-95%
What is the use of cuvettes or absorption cell?
Used in spectrophotometer
Are cuvettes made from glass or plastic?
Yes, these are made up of either glass or plastic
What are the different disturbances to absorbance that may occur when it comes to cuvettes or absorption cell?
1) Scratch
2) Spots
3) Marks
Do all glasswares need to be handled properly?
Yes, all glasswares must be handled properly
What should be prevented in the lab when it comes to lab equipment such as glasswares?
Breakage
Why is breakage needed to be prevented in the lab when it comes to glasswares?
Because it can be dangerous and may result in the loss of valuable and irreplaceable materials
What should be done to flasks and beakers when they are heated over a Bunsen burner?
These should be placed on gauze mat
What is the requirement for test tubes that will be heated?
Test tubes should be made up from heat-resistant materials
What should be done to containers and their corresponding stoppers?
These should be numbered
Why do containers and their corresponding stoppers should be numbered?
To observe direct matching when stoppers are replaced
Is it okay to leave pipettes lying on the tabletops?
No, because by doing so, it will promote bacterial and chemical contamination
What is chromic-sulfuric acid?
A common cleaning agent