/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 192 Gold numbers of protective collo... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 11: Problem 192

Gold numbers of protective colloids \(\mathrm{A}, \mathrm{B}, \mathrm{C}\) and \(\mathrm{D}\) are \(0.50,0.01,0.10\) and \(0.005\), respectively. The correct \mathrm{\\{} o r d e r ~ o f ~ t h e i r ~ p r o t e c t i v e ~ p o w e r s ~ i s ~ (a) \(\mathrm{D}<\mathrm{A}<\mathrm{C}<\mathrm{B}\) (b) \(C

Short Answer

Expert verified
Option (c): \(\mathrm{A}<\mathrm{C}<\mathrm{B}<\mathrm{D}\) is correct.

Step by step solution

01

Understanding Gold Number

The gold number is a measure of the protective power of colloids. It represents the minimum amount (in milligrams) of protective colloid required to prevent the coagulation of 10 ml of gold sol by 1 ml of a 10% sodium chloride solution. A smaller gold number indicates a higher protective power.
02

Identify Gold Numbers

Given the gold numbers: - A: 0.50 - B: 0.01 - C: 0.10 - D: 0.005 These are the gold numbers for the colloids A, B, C, and D, respectively.
03

Determine Protective Power Order

The protective power is inversely proportional to the gold number. Therefore, a lower gold number means a higher protective power. To list these in order from highest protective power to lowest, we arrange them by increasing gold numbers: - D: 0.005 - B: 0.01 - C: 0.10 - A: 0.50
04

Match With Given Options

From the determined order, we match the protective power order (highest to lowest): 1. D2. B3. C4. AThis corresponds to the option (c): \(\mathrm{A}<\mathrm{C}<\mathrm{B}<\mathrm{D}\).

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.

Over 30 million students worldwide already upgrade their learning with 91影视!

Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Gold Number
The gold number is an important concept in understanding colloidal systems. It refers to the minimum amount of a protective colloid needed to stop a colloidal gold solution from coagulating when a salt is added. Basically, if we're dealing with a gold sol mixed with sodium chloride, the gold number tells us how much colloid is needed to keep it stable.

A lower gold number signifies greater protective power because it means less colloid is needed to guard against coagulation. For example, if Colloid C has a gold number of 0.10, this means that 0.10 mg of C is needed to protect the gold sol. Comparing gold numbers like 0.50 or 0.01 helps us rank colloids by their protection effectiveness: the smaller the number, the more efficient the colloid.
Coagulation Prevention
Coagulation prevention is about maintaining the stability of colloids so they don't clump together and settle out of a solution. When these particles come together, or 'coagulate', it can cause issues in various applications where maintaining a uniform mixture is vital.

Protective colloids play a key role in this, as they can stabilize the solution by preventing coagulation. They provide a barrier around colloidal particles, thus reducing the chance of them coming together when salts like sodium chloride are added. A small amount of protective colloid that can effectively prevent coagulation speaks to its high stability-inducing capability.
Protective Colloids
Protective colloids are substances that stabilize other colloidal particles in a suspension by forming a protective layer around them. This layer hinders the particles from sticking together, thus maintaining the uniform distribution of the colloid in the suspension.

They are crucial in many industrial and scientific applications where uniform particle dispersion is crucial. Colloids like gelatin, gum arabic, and albumin are typical examples used in various industries, from food production to pharmaceuticals. By measuring the gold number, you can determine how much of a particular colloid you need to effectively prevent coagulation, ensuring the colloid remains stable.

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

The amount of gas adsorbed physically on charcoal (a) increases with pressure and decreases with temperature (b) increases with temperature and decreases with pressure (c) increases with temperature and pressure (d) increases either temperature or pressure.

\(\mathrm{H}_{2}\) gas is adsorbed on activated charcoal to a very little extend in comparison to easily liquefiable gases due to (a) Very strong van der Waal's interaction (b) Very high critical temperature (c) Very low critical temperature (d) Very weak van der Waals forces

Potassium stearate is obtained by the saponification of an oil or fat. It has the formula \(\mathrm{CH}_{3}-\left(\mathrm{CH}_{2}\right)_{16}-\mathrm{COO}^{-} \mathrm{K}^{+} .\)The molecule has a lyopho- bic end \(\left(\mathrm{CH}_{3}\right)\) and a lyophilic and \(\mathrm{COO}^{-} \mathrm{K}^{+}\). Potassium stearate is an example of (1) lyophobic colloid (2) associated colloid or micelle (3) multimolecular colloid (4) macromolecular colloid (a) 2 only (b) 1 and 2 (c) 3 and 4 (d) 4 only

Which of the following factors are responsible for the increase in the rate of a surface catalysed reaction? 1\. A catalyst provides proper orientation for the reactant molecules to react. 2\. Heat of adsorption of reactants on a catalyst helps reactant molecules to overcome activation energy. 3\. The catalyst increases the activation energy of the reaction. 4\. Adsorption increases the local concentration of reactant molecules on the surface of the catalyst. Select the correct answer using the code given below: (a) 1 and 2 (b) 1 and 3 (c) 2,3 and 4 (d) 1,2 and 4 .

According to Freundlich adsorption isotherm, which of the following is correct? (a) \(\frac{\mathrm{x}}{\mathrm{m}} \propto \mathrm{P}^{1 \mathrm{n}}\) (b) \(\frac{x}{m} \propto \mathrm{P}^{1}\) (c) \(\frac{x}{m} \propto P^{0}\) (d) All the above are correct for different ranges of pressure
See all solutions

Recommended explanations on Chemistry Textbooks

Ionic and Molecular Compounds

Read Explanation

Chemical Analysis

Read Explanation

Nuclear Chemistry

Read Explanation

Inorganic Chemistry

Read Explanation

Making Measurements

Read Explanation

Physical Chemistry

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.