would form for either solution when pure. This can be avoided by being extra careful with the chemicals, especially when the cap is off of the bottle. 2. We may have recorded the results wrong. This can be avoided by double-checking results and making sure that you write them in the right place. 3. We may have put some chemicals in the wrong wells. This can be avoided by double-checking what the directions say to do and if you’re putting each chemical in the right place. Conclusion Ionic compounds can form precipitates in chemical reactions. Each compound forms different precipitates than others. It also forms different precipitates when reacting with different other compounds. My hypothesis was partially correct, because most of the precipitates were noticeably different from each other. However, it was also incorrect because some of the precipitates looked very similar. Questions 1. Which procedure(s) confirm(s) the presence of (a) Cl- ions, (b) Br- ions, and (c) I- ions? a) Add AgNO 3 to a compound. If the solution turns white, add NH 3 . If no chunks are formed, it contains Cl - ions. b) Add AgNO 3 to a compound. If the solution turns a cream color, it contains Br - ions. c) Add NaOCl and starch to a compound. If the solution turns black, it contains I - ions.
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- Spring '14
- Chemistry, Sodium, Sodium chloride, KBr, Unknown solution