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Bio Mystery Powder Lab

In: Other Topics

Submitted By aman1237
Words 1312
Pages 6
Bio 120
Date 2-24-14
Scientific Method Lab
Objective – For this lab, our objective was to identify the five mystery powders given to us which we were similar in appearance and to check their solubility and reactivity with water, vinegar and iodine. The objective was also to record information as accurate as possible and also to make observations in the reactions of five mystery powders with water, vinegar and iodine.
Hypothesis- if we are using all the household mystery powders them they should all dissolve in water because I think all the household powders are soluble in water.
Background information- we were given five different mystery household powders. So, as being different powders their physical and chemical properties will also be different such as some of them will react to water, some will react to vinegar and some to iodine.
1. To ensure that the data is correct all of us the group members did our recordings whatever we saw or observe and then checked it with all of the group members.
2. We also did all the tests one by one first with water, second with vinegar and then with iodine. I thought that if sodium bicarbonate reacts with vinegar then it will also react with iodine which wasn’t true. It reacted only with vinegar.
3. From our observations we used solubility and litmus paper to distinguish one [powder from another.
4. For most of this lab we used qualitative observations because at first before even starting the lab we looked at the unknown powders, potato, tums to see their color, texture, smell which are the qualities. Even during the experiment we looked at these qualities if they will change by adding water, vinegar or iodine to them. The quantitative method, we quite didn’t use it in this lab except for the part when we added water, vinegar or iodine drop by drop to the powders to see if the quantity will make any difference in

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