Solution Investigation Question: What are some of the key characteristics of unknown sample of an aqueous...

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Chemistry

Solution Investigation Question: What are some of the keycharacteristics of unknown sample of an aqueous solution containingan ionic compound?
Specific questions: 1. Given that the cation is from Group 1A,what is the identity of the group 1A metal ion in yoursolution?
2. Given that the ionic compound contains either chloride orhydroxide, how can you determine which? (Two pieces of evidence arerequired and one must be related to solubility rules)
3. What is the concentration of your solution? (Your unknownsample is known to be about 1 M, but you need to determine theconcentration to 3 significant figures using titration. You shouldplan ahead so that you know approximately what volume of yoursample you will need in order to use approximately 25 mL of 0.100 Msulfuric acid for the titration).

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4.2 Ratings (659 Votes)

Answer 2When two solutions are mixed a compound formed from a cation in one solution and an anion in the second solution will precipitate if its concentration is higher than its solubility see Section 44 of Silberberg Therefore the solubility test can be conducted by mixing a few drops from two different solutions and noting whether a precipitate formsThe formation of a solid precipitate will be evident due to the increased turbidity of the mixtureFor qualitative analysis often only general trends in solubility need to be known These trends can be summarized by a set of relatively simple rules often referred to as the solubility rules So if the anion is Cl Br I then cation will be Any except Ag Pb2 Hg2Cuand the compound will be Soluble Or if the anion is OH S2 then cation will be Any except alkali metal ions NH4 Sr2 Ca2 Ba2and the compound will be Insoluble Answer3 Assuming if we can burn away the water and just leave the material remaining we can easily find the unknown This requires both step 2 and 3 to be completed The first thing is we know the concentration So since we know the concentration we can get a specific amount of moles Lets just assume for the sake of this that you have 1 mol of the solution We also know if it is a See Answer

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