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Determining unknown solutions. Questions: Are there any silver, strontium, and/or zinc ions in the number 3 unknown solution

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Introduction

Purpose: This experiment is being performed because it shows how ions react together in a solution. We can learn how solubility works and determine the identity of an unknown solution. Questions: Are there any silver, strontium, and/or zinc ions in the number 3 unknown solution. Material Apparatus A beaker of number 3 unknown solution Filter paper NaCl solution 3 test tubes NaOH solution Dropper Na2SO4 solution Funnel Test tube rack Introduction: Some chemical substances have high solubility; those chemical substances can dissolve in water. Some chemical substances have very low solubility, if you put those chemical in water, it will product precipitate. On the basis of solubility, we can determine what chemical ions solution has. ...read more.

Middle

It means there is Sr2+ in the solution. Procedure: 1. Put 3 test tubes in test tube rack. Mark #1, #2 and #3 test tubes. 2. Use the dropper put some #3 unknown solutions into #1 test tube. 3. Use the dropper put excess sodium chloride solution into the #1 test tube. Shake the #1 test tube, wait a moment. 4. If there are some precipitate in the #1 test tube, use filter paper and funnel to filter precipitate out. Put filtrate into #2 test tube. Put excess sodium hydroxide solution into #2 test tube. Shake it, wait a minute. 5. If there are some precipitate, use filter paper and funnel to filter precipitate out. Put filtrate into #3 test tube. Put excess sodium sulfurate (Na2SO4) into #2 test tube. Wait a minute, see what happen. ...read more.

Conclusion

Mg2+ and Ca2+ could react with NaOH solution and Na2SO4 solution that we put into the test tubes. * Are there any major flaws in the lab design or procedure? We use the same dropper that contains 3 kinds of solutions, they could make another reaction. * Were the material and/or apparatus adequate to provide reliable results? No, we just know there are precipitate or not, but we don't know what the precipitate is, so I think we need other material to provide what the precipitate. * Are there any suggestions that could be made to improve the procedure, material or apparatus that would help to improve the procedure? We should use the 3 different droppers to put the 3 kinds of solutions into test tubes. We should use distilled water to wash the dropper and test tubes. ?? ?? ?? ?? ...read more.

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