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Virgen Milagrosa University Foundation

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History1English8Nursing1Geometry1Chemistry3
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need help answering pre lab questions so confused

Determine the expected color and consistency for each of the unknowns as a solid. 2. Predict observable reactions between the unknowns and each of the given solutions. Write balanced equations (including phases) for expected reactions. Cite your sources. 3. Organize your expected reactions into groups of reactions with each of the given solutions. 4. List any substances you unsure of the reactions

Experimental Overview:
In this laboratory exercise you will play the role of analytical chemist by developing a scheme to unambiguously identify each of 20 different common chemical substances. However, unlike the analytical or forensic chemist, you only need to uniquely identify each chemical from the other 19 on the list, not all of the possible chemicals in the world. In contrast to experiments that you are familiar with, you won't be given specific instructions about how to proceed. Instead, you will develop your own analytical procedure using physical and chemical methods of analysis. As part of this process, you will create an identification flow chart that will lead you like a road map to the identity of any of the substances on the list.
Many of the concepts and principles that you will use in developing your identification scheme should already be familiar to you from your General Chemistry class and experiments that you have done previously.

Chemistry in a Sustainable World1
You may be wondering about the large number of chemicals used in this procedure and the total amount of waste that will be generated by students in this course. "Going green" is not always a straightforward process and it is often necessary to reach a compromise between the achievement of experimental goals and the elimination of all chemical risk. This compromise often involves modification of experimental procedures and substitution of more benign reactants. When assessing substances it is important to consider not only their physical and chemical properties but also their toxicity and impact on the environment. For this experiment, chemicals have been selected that are as benign as possible and a microscale format will be utilized to decrease the amount of chemicals used and the total waste produced.

When you arrive in lab the following testing reagents will be provided, these will be labeled with their concentration and correct name: 1 M HCl 1 M H2SO4 1 M NaOH 1 M CH3COOH 1 M NaCl H2O
Near the balances you will notice several complete sets of the chemicals listed in Table 6.1. These are labeled and identified with unknown numbers. Rather than bringing these chemicals to your usual workstation, you will go to the chemicals with the testing reagents. Because you are using a common set of chemicals with other students, it is important that you follow some basic laboratory protocols:

The report due for this lab will include a complete flowchart that outlines your classification scheme for the chemicals used in this lab with your observations for each reaction.
Flowcharts are used to create visual maps of a process and should show all steps in the analysis. For this assignment, you should consider the flowchart as a "road map" of laboratory procedures that you will follow to lead you to a correct identification. Your flowchart can be drawn by hand or on a computer using MS Word, or another flowcharting software application. It is not necessary to fit the entire flowchart on one page but transitions to other pages should be clearly referenced.
The flowchart that follows represents a scheme to distinguish between five aqueous solutions: KCl, SrCl2, HCl, NaNO3, and HNO3. These are all clear and colorless and thus cannot be

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