Pre-Lab Assignment
Name: Divya Paul _____
Exp # 1
Title: “Introduction to Measuring Techniques”
Brief description of tasks
In this experiment, we will be utilizing a variety of common laboratory methods to measure solids
and liquids including the balance, graduated cylinder, pipet, and buret. We will also become
familiar with dispensing liquids and understanding how to read measurements.
Outline of the experiment (major steps), and an example of Calculations
Balance
1. Turn on balance and place weighing paper on pan once display is at 0
2. Record the mass
3. Place 1/3 tsp of the solid onto the pan and record the mass
4. Calculate how much solid you have (mass of paper and solid – mass of
weighing paper) and record the mass
5. Repeat the first 3 steps and spoon out about 1 g of the solid to weigh out predetermined amount of solid
Graduated Cylinder
6. To get mass of 6mL of liquid from graduated cylinder, first add water up to
6 mL line
7. Dry your beaker and measure its weight
8. Pour the water into the beaker and reweigh it
Pipet
9. Fill a beaker halfway with water
10. Attach the pump to the pipet’s top and draw water in by placing the spout
under water and turning the pump wheel in a clockwise motion
11. Remove spout from under the water after the water reaches past the last
graduation
12. Weigh another dry beaker and record mass
13. Place 6 mL of water into beaker and record its mass
Buret
14. Clamp a buret by attaching the buret clamp to a stand
15. Rinse the buret by adding 6 mL of water using a funnel and letting the water
run into a waste container
16. Then, fill the buret to a satisfactory level and let the liquid run into the waste
container until reaching the desirable amount
17. Dry a beaker and measure its mass
18. Add 6 mL of water into the beaker from the buret and reweigh
Calculations
Mass of weighing paper = 0.3670 g
Mass of solid and weighing paper = 0.5881 g
Mass of substance = mass of solid and weighing paper – mass of weighing paper
= 0.5881 g – 0.3670 g
= 0.2211 g
Turn over
Pre-Lab Assignment
Table of the Reagents
Chemical name
Formula
Water
H2O
Unknown
Solid
N/A
Molecular wt
18.015 g/mL
N/A
Physical State
Amount to use
Liquid
18 mL total
(used 6 mL
three times)
Solid
1/3 of tsp
and 1 g