Of the following ionic substances – N a C l , M g C l 2 , A l C l 3 , the most effective ionic substance that coagulates the negatively charged colloidal Sulfur consists of S 2 O 3 − ions has to be identified. Concept Introduction: Based on the particle size of the components, solutions can be of three types – true solutions, colloidal solutions and suspension. Colloidal solutions have the particle size of the range 1 - 1 0 0 0 n m . A colloidal solution is made of dispersed phase and dispersion medium which corresponds to solute and solvent respectively. Depending upon the physical state of dispersed phase and dispersion medium, there are various types of colloids such as gel, foam, alloy, sol etc.

Question

To obtain a precipitate which is useful for gravimetric analysis, the analyst tries to obtain conditions to encourage crystal growth, as opposed to the formation of a colloid. Which of the following statements aids in the formation of a crystalline precipitate and the formation of a colloidal precipitate? Drag your answers to the appropriate markers. (a) The solutions are made as dilute as practical to allow crystals to form slowly. (b) The addition of strong electrolytes (e.g. NaCl or HCl) in the analyte solution, prior to the precipitation reaction. (c) After the digestion of the precipitate, the hot solution is cooled down to room temperature gradually and kept undisturbed overnight. (d) The analyst selects the precipitate of the analyte with the Ksp less than 1 x 10 -15 (e) The Relative Supersaturation value of the analyte solution should be greater than 1 million upon the addition of the precipitating reagent. formation of colloidal precipitate favored formation of crystalline…

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Question

Chapter 12.9, Problem 12.18E

Interpretation Introduction

Interpretation:

Of the following ionic substances – NaCl,MgCl2,AlCl3 , the most effective ionic substance that coagulates the negatively charged colloidal Sulfur consists of S2O3− ions has to be identified.

Concept Introduction:

Based on the particle size of the components, solutions can be of three types – true solutions, colloidal solutions and suspension. Colloidal solutions have the particle size of the range 1 - 1000 nm.

A colloidal solution is made of dispersed phase and dispersion medium which corresponds to solute and solvent respectively. Depending upon the physical state of dispersed phase and dispersion medium, there are various types of colloids such as gel, foam, alloy, sol etc.

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