Qualitative Analysis of Cations Overview Getting Started Techniques Procedure FAQ Full Lab Manual Introduction & Goals Chemistry & Background Key Questions Prelab Problems Safety Procedure In Your Write-up Experiments Index ChemLab Home		Before Lab Good prelab preparation will help your experiments to go smoothly this week. There are four prelab problems that must be completed as part of your prelab write-up before coming to lab. Your procedural flowchart should be a description of the entire analysis scheme, with separation and confirmation of each ion included. This detailed procedural flowchart will be checked by your TA before you begin experiments. Since there are no calculations for this week's lab, a sample calculation or analysis outline is not required in your prelab. In Lab Complete the relevant experiments in Sections 1 through 4, making complete observations in your notebook. It is important that you describe all of the chemistry you observe during the analyses of known and unknown solutions, including the net reactions for each experiment. If you have trouble balancing the equations, ask your TA for help before leaving the lab. Uncertainty Analysis An uncertainty analysis evaluates the accuracy of calculated, numerical results. The simplest form of uncertainty analysis is to use the significant figures rules. In this experiment, your results are completely qualitative. You will state which cations your unknown sample contains and support your conclusions with observations. Because nothing is calculated this week, no uncertainty analysis is required. After Lab Be sure that your lab notebook contains sections 1-5 described in the introduction of this manual. Fill out and turn in the data sheets found in the manual. State which ions are present in your unknown mixture and describe your reasoning for reaching these conclusions.
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