CHEM 121 LAB REPORT 5 BONDING TYPE
IDENTIFICATION USING SOLUBILITY 2026
◉ Put the #s in correct order:
When using the Tare function on a balance, start by
______________ Then, ________________ to cancel out that mass. Finally,
______________ and record the mass of your sample.
1)Add your sample to the glassware
2)Placing the glassware on the balance.
3)Pressing the Tare/Zero button. Answer: 2,3,1
◉ What should you do if you are using a balance that has persistent
fluctuations in mass? Answer: Contact your TA or instructor to
adjust the balance.
◉ Identify techniques to be used for accurate solution preparation
using a volumetric flask. Answer: Read the liquid volume at eye level
from the bottom of the meniscus.
After the solvent is added, stopper and invert the flask to mix the
solution.
◉ Put the #'s in correct order:
,In order to use a pipet, place a __________ at the top of the pipet. Use
this object to fill the pipet such that the __________ of the liquid is even
with the volume line. Release the liquid, touching the tip of the pipet
to the side of the container if necessary to release the last drop
__________ the pipet tip.
1) Outside
2) Bulb or pump
3) Meniscus Answer: 2,3,1
◉ A 24.5 g sample of solution has a density of 0.768 g/mL. What is
the sample volume (in mL)? Answer: 31.9 mL
◉ Find the average mass of product:
1)2.73g
2)2.00g
3)1.97g
4)1.47g
5)2.98g
6)2.28g Answer: 2.235g
◉ Two students preform a titration multiple times withe the
averages being: Student A: 0.125 ± 0.008 M and Student B: 0.12 ±
0.03 M. Who has the more precise work, and why? Answer: Student
A because that student's data has a smaller standard deviation.
, ◉ How many significant figures are in the number 2.1? Answer: 2
◉ Choose the best graduated cylinder to make each measurement in
a single use:
1) 5.75 mL of a sucrose solution
2) 18.5 mL of a NaCl solution
3) 36 mL of water
a) A 25 mL graduated cylinder with markings every 1 mL
b)A 50 mL graduated cylinder with markings every 10 mL
c)A 10 mL graduated cylinder with markings every 0.1 mL Answer:
1) c, 2) a, 3) b
◉ What are the best practices while sharing a lab balance with other
students? Answer: Brush off any chemical dust around the balance
after each use. Alert your TA or instructor about any issues with the
balance.
◉ Identify which balance was used to make each mass reading:
1) .90 g
2) 1.230 g
3) 6.539 g
4) 5.43 g
IDENTIFICATION USING SOLUBILITY 2026
◉ Put the #s in correct order:
When using the Tare function on a balance, start by
______________ Then, ________________ to cancel out that mass. Finally,
______________ and record the mass of your sample.
1)Add your sample to the glassware
2)Placing the glassware on the balance.
3)Pressing the Tare/Zero button. Answer: 2,3,1
◉ What should you do if you are using a balance that has persistent
fluctuations in mass? Answer: Contact your TA or instructor to
adjust the balance.
◉ Identify techniques to be used for accurate solution preparation
using a volumetric flask. Answer: Read the liquid volume at eye level
from the bottom of the meniscus.
After the solvent is added, stopper and invert the flask to mix the
solution.
◉ Put the #'s in correct order:
,In order to use a pipet, place a __________ at the top of the pipet. Use
this object to fill the pipet such that the __________ of the liquid is even
with the volume line. Release the liquid, touching the tip of the pipet
to the side of the container if necessary to release the last drop
__________ the pipet tip.
1) Outside
2) Bulb or pump
3) Meniscus Answer: 2,3,1
◉ A 24.5 g sample of solution has a density of 0.768 g/mL. What is
the sample volume (in mL)? Answer: 31.9 mL
◉ Find the average mass of product:
1)2.73g
2)2.00g
3)1.97g
4)1.47g
5)2.98g
6)2.28g Answer: 2.235g
◉ Two students preform a titration multiple times withe the
averages being: Student A: 0.125 ± 0.008 M and Student B: 0.12 ±
0.03 M. Who has the more precise work, and why? Answer: Student
A because that student's data has a smaller standard deviation.
, ◉ How many significant figures are in the number 2.1? Answer: 2
◉ Choose the best graduated cylinder to make each measurement in
a single use:
1) 5.75 mL of a sucrose solution
2) 18.5 mL of a NaCl solution
3) 36 mL of water
a) A 25 mL graduated cylinder with markings every 1 mL
b)A 50 mL graduated cylinder with markings every 10 mL
c)A 10 mL graduated cylinder with markings every 0.1 mL Answer:
1) c, 2) a, 3) b
◉ What are the best practices while sharing a lab balance with other
students? Answer: Brush off any chemical dust around the balance
after each use. Alert your TA or instructor about any issues with the
balance.
◉ Identify which balance was used to make each mass reading:
1) .90 g
2) 1.230 g
3) 6.539 g
4) 5.43 g
