Chapter 5: Q. 5.79 (page 208)

Most pasta recipes instruct you to add a teaspoon of salt to a pot
of boiling water. Does this have a significant effect on the boiling temperature?
Justify your answer with a rough numerical estimate.

Short Answer

Expert verified

There is hardly any effect on the boiling temperature of water.

Step by step solution

Given information

Addition of salt effects the boiling temperature of water. The shift in the boiling temperature is given by

$T - T_{\circ} = \frac{n_{B} R {T^{2}}_{\circ}}{L} H e r e, T_{o} i s b o i l i n g t e m p e r a t u r e o f w a t e r w i t h o u t a n y s o l u t e; n_{B} i s n o . o f m o l e s o f s o l u t e; L i s l a t e n t h e a t o f f u s i o n .$

Effect of adding salt

We are adding a tablespoon of salt.

Assuming a tablespoon of salt = 6g

$n = \frac{m}{M} M = 58.44 \frac{g}{m o l} m = 6 g n = \frac{6}{58.44} n = 0.1026 \frac{g}{m o l}$

substituting the values

T_o = 373 K

n = 0.1026

R = 8.3 1 $\frac{J}{} K - m o l$

L = $2.26 \times 10^{6} J$

localid="1647192130510" $T - T_{o} = \frac{0.1026 \times 8.31 \times {(373)}^{2}}{2.26 \times 10^{6}} T - T_{o} = 0.053 K T = 373 + 0.053 = 373.053 K$

This change is hardly significant.

Unlock Step-by-Step Solutions & Ace Your Exams!

Full Textbook Solutions
Get detailed explanations and key concepts
Unlimited Al creation
Al flashcards, explanations, exams and more...
Ads-free access
To over 500 millions flashcards
Money-back guarantee
We refund you if you fail your exam.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

Recommended explanations on Physics Textbooks

View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Most pasta recipes instruct you to add a teaspoon of salt to a pot
of boiling water. Does this have a significant effect on the boiling temperature?
Justify your answer with a rough numerical estimate.

Short Answer

Step by step solution

Given information

Effect of adding salt

substituting the values

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Physics Textbooks

Quantum Physics

Wave Optics

Thermodynamics

Fundamentals of Physics

Engineering Physics

Electricity

Study anywhere. Anytime. Across all devices.

Most pasta recipes instruct you to add a teaspoon of salt to a potof boiling water. Does this have a significant effect on the boiling temperature?Justify your answer with a rough numerical estimate.

Short Answer

Step by step solution

Given information

Effect of adding salt

substituting the values

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Physics Textbooks

Quantum Physics

Wave Optics

Thermodynamics

Fundamentals of Physics

Engineering Physics

Electricity

Study anywhere. Anytime. Across all devices.

Most pasta recipes instruct you to add a teaspoon of salt to a pot
of boiling water. Does this have a significant effect on the boiling temperature?
Justify your answer with a rough numerical estimate.