Prelab answers

Prelab answers - 6 The centrifuge is used to separate the...

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Pre-Lab Answers 1. The purpose of qualitative analysis is to figure out what is present is in the solution. However, qualitative analysis cannot figure out how much is present. 2. The known solution has all of the ions in it that will be tested for. By doing each test on the known solution, you can obtain observations of what will happen if each ion was present. These observations can then be used as a means of comparison for the unknown solutions. 3. When you heat a solution, you speed it up. 4. Stirring each solution after you add a new chemical ensures that the chemicals mix completely and that a complete reaction occurs. 5. Washing a precipitate helps to get rid of contaminants (such as other ions) that could be left behind after decanting the solution.
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Unformatted text preview: 6. The centrifuge is used to separate the precipitate from the supernatant solution 7. The main type of reaction in this lab is a double replacement reaction. We see this because precipitate forms. 8. The main way of identifying or confirming the presence of a certain ion is to see if they form a precipitate or a colored liquid is present. The five final products that will confirm the presence of the five ions are: AgCl, Cu 2 [Fe(CN) 6](s) , FeSCN 2+ , K 2 Zn 3 [Fe(CN) 6 ] 2 , Al(OH) 3(s) . 9. The five complex ions include: Ag(Nh 3 ) 2 + (aq) , Al(OH) 4-(aq) , Zn(OH) 4 2 (aq) , Cu(NH 3 ) 4 2+ (aq) , FeSCN 2+ (aq) . 10. Some ions are left out because they are “Spectator ions” and do not take place in the reactions....
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