In the course of various qualitative analysis procedures, the following mixtures are encountered: (c) Mg 2+ and K + (d) Ag + and Mn 2+ . Suggest how each mixture might be separated.

Hey everyone today, we're being asked to identify which re agents can be used to separate. Strong team Two plus and A. D. Plus from solution. Now, although it's not explicitly stated in the question we need to assume that both of these Catalans are present in Aquarius solutions in a creative solutions. Because only then will the scalability rules that we need to use apply for the re agents that we're using. So with that in mind we can go ahead and start taking a look at our re agents. Now we need to find out which re agent or which set of agents will help us precipitate out one of the Catalans while leaving the other in solution so that we can separate them easily. Starting with the 1st 16 molar hydrochloric acid, it'll end up forming two products with both the Catalans. Will I end up having strontium chloride, 28 di chloride SRC L. Two and silver chloride. Now, as a rule of thumb, generally chlorine, bromine and iodine will end up forming soluble salts with most metals. However, there are exceptions to this rule, one of which is silver, the others are lead and mercury but silver ends up making the salt that is formed through the reaction of chlorine insoluble. So this will actually be insoluble. So right there since this is insoluble but the strontium chloride is not this will remain soluble. This actually means that our answer is the very first option choice answer choice A With six more hydrochloric acid. We can also rule out the other ones. Excuse me. Because for be the or hydrogen sulfide would end up forming two soluble salts, and the same could go for the ammonium sulfide at two molar hydrochloric acid, it would still form or soluble salts, and even the phosphates would be soluble but not nearly as soluble as the salt. Earlier. I hope this helps, and I look forward to seeing you all in the next one.

Ch.17 - Additional Aspects of Aqueous Equilibria

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Brown 14th Edition

Ch.17 - Additional Aspects of Aqueous Equilibria

Problem 79c,d

Chapter 17, Problem 79c,d

In the course of various qualitative analysis procedures, the following mixtures are encountered: (c) Mg²⁺ and K⁺ (d) Ag⁺ and Mn²⁺. Suggest how each mixture might be separated.

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Identify the chemical properties of Ag^+ and Mn^2+ that can be used for separation.

Consider the solubility rules: Ag^+ forms an insoluble chloride (AgCl) when reacted with Cl^- ions, while Mn^2+ does not.

Add a source of chloride ions, such as HCl, to the mixture to precipitate AgCl, leaving Mn^2+ in solution.

Filter the mixture to separate the solid AgCl from the aqueous Mn^2+ ions.

Wash the precipitate to remove any remaining Mn^2+ ions and confirm the separation by testing the filtrate for the presence of Mn^2+.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Qualitative Analysis

Qualitative analysis is a branch of chemistry that focuses on identifying the components of a mixture rather than quantifying them. It involves various techniques to separate and detect ions or compounds based on their chemical properties. Understanding qualitative analysis is essential for determining how to separate specific ions, such as Ag+ and Mn2+, from a mixture.

Precipitation Reactions

Precipitation reactions occur when two soluble salts react to form an insoluble compound, or precipitate. This concept is crucial for separating ions in a mixture, as specific reagents can be added to selectively precipitate one ion while leaving the other in solution. For example, adding chloride ions can precipitate Ag+ as AgCl, allowing for the separation from Mn2+.

Solubility Rules

Solubility rules are guidelines that predict the solubility of various ionic compounds in water. These rules help chemists determine which compounds will dissolve and which will precipitate under certain conditions. In the context of separating Ag+ and Mn2+, knowing the solubility of their respective salts is vital for choosing the right reagents and conditions for effective separation.

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Solubility Rules

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Textbook Question

A solution containing several metal ions is treated with dilute HCl; no precipitate forms. The pH is adjusted to about 1, and H₂S is bubbled through. Again, no precipitate forms. The pH of the solution is then adjusted to about 8. Again, H₂S is bubbled through. This time a precipitate forms. The filtrate from this solution is treated with (NH₄)₂HPO₄. No precipitate forms. Which of these metal cations are either possibly present or definitely absent: Al³⁺, Na⁺, Ag⁺, Mg²⁺?

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Textbook Question

In the course of various qualitative analysis procedures, the following mixtures are encountered: (a) Zn²⁺ and Cd²⁺. (b) Cr(OH)₃ and Fe(OH)₃ Suggest how each mixture might be separated.

Textbook Question

Suggest how the cations in each of the following solution mixtures can be separated: (c) Pb2 + and Al3 +.

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Textbook Question

(b) What is the most significant difference between the sulfides precipitated in group 2 and those precipitated in group 3?

Textbook Question

Derive an equation similar to the Henderson–Hasselbalch equation relating the pOH of a buffer to the pKb of its base component.

In the course of various qualitative analysis procedures, the following mixtures are encountered: (c) Mg2+ and K+ (d) Ag+ and Mn2+. Suggest how each mixture might be separated.

Verified video answer for a similar problem:

Key Concepts

Qualitative Analysis

Precipitation Reactions

Solubility Rules

In the course of various qualitative analysis procedures, the following mixtures are encountered: (c) Mg²⁺ and K⁺ (d) Ag⁺ and Mn²⁺. Suggest how each mixture might be separated.