Laboratory Glassware and equipment
Outline Welcome Reading a Meniscus Types of Glassware Reading and Recording Volumes Cleaning Glassware Digital Thermometer Using Graduated Glassware Using a Buret Using a Pipet Using a Volumetric Flask Cleanup Next Assignment
Welcome Welcome to the chemistry lab! Chemistry is a lot of fun, but can be even more so if you are familiar with the equipment you will be using in lab. Remember – whenever there’s glassware or chemicals out in lab, everyone has to wear goggles!
Reading a Meniscus Meniscus and Parallax
Types of Glassware Graduated glassware Volumetric (non-graduated) glassware
Graduated Glassware Beakers Filtering Flasks Graduated Cylinders Use: To contain certain volumes of solutions Filtering Flasks Graduated Cylinders Use: To measure out exact volumes. Burets Use: To dispense exact volumes.
Volumetric (non-graduated) Glassware Volumetric Pipets Use: To measure out exact volumes. This is the most accurate glassware in lab. Volumetric Flasks Use: To make up specified volumes and concentrations of solutions.
Reading and Recording Volumes We use significant figures to indicate the accuracy and precision of glassware. Significant figures for graduated glassware are determined differently from those of volumetric glassware.
Significant Figures: Volumetric Glassware Glassware tolerance is printed on the glassware. For example: The 50 mL volumetric flask has a tolerance of ± 0.05 mL. Whenever you use your 50 mL volumetric flask, you will always report two zeros after the decimal, i.e. 50.00 mL.
Volumetric Flask When this volumetric flask is filled to the calibration mark, what volume should be reported?
Volumetric Pipet When this pipet is used to dispense solution, what volume should be reported?
Volumetric Pipet When this pipet is used to dispense solution, what volume should be reported? And to which line should the pipet be filled?
Significant Figures: Graduated Glassware Look at the glassware in question. Find the smallest graduation. Report your volume to the closest 10% of the smallest graduation.
Reading Graduated Glassware
Reading Graduated Glassware
Reading Graduated Glassware
Reading Graduated Glassware
Reading Graduated Glassware
Reading Graduated Glassware
Smallest Graduation A. Calculate major graduation – major graduation B. Determine the number of spaces between two major graduations Smallest Graduation = A / B
Reading Beakers What volume should be reported?
Reading Beakers Smallest graduation: 10 mL 10% value: 1 mL Volume to the closest 10% of the SG: 48 mL
Reading Graduated Cylinders What volume should be reported?
Reading Graduated Cylinders Smallest graduation: 1 mL 10% value: 0.1 mL Volume to the closest 10% of the SG: 52.8 mL
Reading Burets What volume should be reported?
Reading Burets Smallest graduation: 0.1 mL 10% value: 0.01 mL Volume to the closest 10% of the SG: 40.05 mL
Cleaning Glassware Each student has glassware at their individual stations. Each student is responsible for the care of their glassware. Wash glassware with soap and a brush Rinse glassware with tap water Do a final rinse with very little distilled water from the distilled water faucet or from your water bottle Dry your glassware Return glassware to the APPROPRIATE drawer
Cleaning Carefully clean and dry all of the equipment you used today. Glassware gets slippery when wet, so hold on! Place your equipment / glassware in the appropriate locations in the glassware drawer. If you are unsure of their proper location, ask your instructor.