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?

Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter14: Chemical Equilibrium
Section: Chapter Questions
Problem 14.67QE
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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

(a) The solution is kept in room temperature during the precipitation of the analyte to slow down the movement of ions to allow crystals to form. ___________

 

(b) The solutions are mixed rapidly with the aid of a stirring rod to allow the appropriate ions to make contact without interference of other materials._____________

(c) The addition of large amount of the precipitating agent at the center of the solution without stirring the analyte solution. _______________

(d) The analyst selects the precipitate of the analyte with the Ksp less than 1 x 10 -15

______________

(e) The analyte solution and the precipitating reagents are mixed together at a near boiling temperature. _______________

 

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