Log in
Chemistry
1
answer
0
watching
87
views
28 Nov 2019

To prevent the roads from freezing, salt is spread on the roads before, during and/or after icy conditions. Which of the following salts would be the most effective at lowering the freezing point? Make sure to take into consideration solubility.

A. C12H22O11 B. NaCl C. Cr3(PO4)2 D. CaCl2

Watch
1
answer
0
watching
87
views

For unlimited access to Homework Help, a Homework+ subscription is required.

Hubert Koch
Hubert KochLv2
11 Jul 2019

Unlock all answers

Get 1 free homework help answer.
Already have an account? Log in
Share
discord banner image
Join us on Discord
Chemistry Study Group
Join now

Related textbook solutions

Basic Chemistry
5 Edition,
Timberlake
ISBN: 9780134138046
Principles of Chemistry Molecular Approach
4th Edition,
Tro
ISBN: 9780134112831
Principles of Chemistry Molecular Approach
3rd Edition, 2014
Tro
ISBN: 9780321971944
Chemistry: Structure and Properties
2nd Edition,
Tro
ISBN: 9780134293936
Chemistry: A Molecular Approach
3rd Edition,
Tro
ISBN: 9780321809247
Chemistry: A Molecular Approach
5th Edition,
Tro
ISBN: 9780134874371
Principles of Chemistry: A Molecular Approach
4th Edition,
Tro
ISBN: 9780134895741
Chemistry: The Central Science
14th Edition, 2017
Brown
ISBN: 9780134414232

Related questions

Below, is a completed lab. After completing this lab, I was asked the following question:

What changes would you make, if any, if you did this lab again?

I'm having a hard time thinking of what I would do different. Please help!

Observations & Questions for Part 1

Record your observations and your time and temperature data in tables. Use one table for the pure water and one table for the salt solution.

Data Table 1: Pure Water and Salt Solution

Seconds

Distilled H20

Room temp

Distilled H20 Ice bath

Saltwater

Room temp

Saltwater Ice bath

0

23

23

17

23

30

23

10

20

7

60

23

4

22

1

90

22.5

1

22

0

120

22.5

0

22

0

150

0

22

-1

180

-1

22

-1

210

-1

22

-2

240

-2

-2

270

-1

-2

300

-1

-2

330

-1

-2

360

-1

390

0

420

0

450

0

480

0

510

0

540

570

600

630

660

Make two graphs of your data. On one graph plot the data from the pure water. On the other graph plot the data from the salt solution. On both plot temperature on the y-axis and time on the x-axis.

A. Record the freezing point of the pure water and the freezing point of the salt solution.

Freezing point of salt Sol: -2 degree Celsius

Freezing point of pure H2O: 0 degree Celsius

B. How do these two freezing points compare?

The freezing point of salt water is lower than the freezing

point of fresh water. Salt in the water lowers the freezing point

of water.

C. What are some practical applications of freezing point depression, boiling point elevation, and vapor pressure lowering?

Some practical applications of freezing point depression

are antifreeze in a radiator and salt on the road used to melt

ice in the winter. Some practical applications of boiling point

elevation are a sealed container and possibly a pressure cooker.

Some practical applications of vapor pressure lowering are freeze

drying and steam engines.

Questions - Part 2

To what biological structure is the dialysis bag comparable? How is it similar? How is it different?

The plasma membrane is comparable to the dialysis bag.

The similarity between them is that they are both semipermeable.

The difference is the dialysis bag acts as a permeable membrane,

however, purely based on its pore size, the small molecules are

able to get through but the bigger molecules are unable to. The

plasma membrane is a more complex system that uses both active

and passive transport to allow the molecule to move through.

In biological systems if a cell is placed into a salt solution in which the salt concentration in the solution is lower than in the cell, the solution is said to be hypotonic. Water will move from the solution into the cell, causing lysis of the cell. In other words, the cell will expand to the point where it bursts. On the other hand, if a cell is placed into a salt solution in which the salt concentration in the solution is higher than in the cell, the solution is said to be hypertonic. In this case, water will move from the cell into the solution, causing cellular death through crenation or cellular shrinkage. In your experiment is the Karo

Lab Report: Make sure your report includes the data and observations from your experiment, calculations of molar mass and a brief discussion of possible sources of error. Also include the answers to the following questions: 1. Explain the effect of each of the following errors upon your calculated molar mass. Be specific as to whether the result would be high or low and explain why. a. Some solvent is lost by evaporation. b. Some of the unknown is lost during transfer to the test tube. c. The thermometer consistently reads one degree too low. d. Part of the solute does not dissolve. 2. Is it necessary that the solvent be absolutely pure? Explain your answer clearly. 3. Many ionic compounds, e.g., NaCl, are strong electrolytes and dissociate completely upon dissolution in water. Explain clearly the effect upon the freezing point when a 1.00 m solution of NaCl in water is made (calculate the freezing point). Hint: What is the van't Hoff i-factor for this solute?


Weekly leaderboard

Home
Homework Help 3,900,000
Chemistry 830,000
Start filling in the gaps now
Log in