Measuring Vessels Flashcards
MEASURING VESSELS
Volumetric flask
Erlenmeyer flask
Griffin beaker
Burets
Graduated cylinder
Filtering flask
Semi-accurate –
Graduated cylinder
the diameter is not that narrow, it is wider, which creates a tendency for inaccurate reading on each markings of the fluid on where it is actually up to.
Graduated cylinder
Extremely convenient for rapid measurement of liquid
Graduated cylinder
Can graduated cylinder be heated
NO
Long cylindrical graduated laboratory glassware with stopcock
Burets
2 types of burets
Glass - acid
Rubber - alkali
The body contains calibration marks that is etched permanently, and a precision cock, or stopcock, at the bottom.
Burets
Extremely accurate in dispensing aliquots of a solution (compared to graduated cylinder)
Burets
Has very small accuracy tolerance – the narrower the diameter, the smaller the margin of error for you to miss the line especially when determining the meniscus.
Burets
The precision is necessary for determining the concentration of acids and bases (titration)
Burets
Burets are generally used for
Titrations
Generally used for
Preparation of standard solution
Measuring liquid volume accurately
Volumetric flask
Round at the lower portion, flat at the bottom, long thin neck with an etched calibration line, that can only hold exactly one amount of liquid
Volumetric flask
Used to transfer measured volumes of liquid between containers
Pipets
