state the name and function of any two devices that are used to measure the volume of liquids
Answers
Answer:
Volumetric Vessels and other Tools in the Chemical Laboratory
Various laboratory vessels and devices are used for preparation of solutions and manipulation with liquids. They differ in the intended use and accuracy. Precise volumes must always be measured at constant temperature because, due to thermal expansion, changes in temperature are followed by changes in volume. For example water at 10 °C has much smaller volume than at 80 °C.
Volumetric vessels are usually calibrated for 20 °C (25 °C in the USA). Calibration temperature is written at every volumetric vessel. Substantial error may result e.g. from change in temperature during dilution of an acid. A lot of heat is released during dilution and temperature increases. When the volume of acid is measured immediately, the real volume after cooling-down will be smaller. The requirement for constant temperature must therefore be observed.
Devices for measuring volume of liquids
Device Usual range of volumes Accuracy
Erlenmayer flask, beaker 5–5000 mL *
Volumetric flask 5–2000 mL high
Volumetric cylinder 5–2000 mL medium
Burette 1–100 mL high
Pasteur pipette 1–5 mL low
Glass pipette 1–100 mL high
Pipetor 5–5000 μL high
Automatic dispenser 0.1–100 mL medium
Microsyringe 0.5–1000 μL high
piston dispenser 1–500 ml medium
Explanation:
Volumetric flask. 5–2000 mL
Volumetric cylinder 5–2000 mL
Burette. 1–100 mL
they are used to measure the volume of an object. If the object is irregular, measuring jar is used and volume is measured