Pre-Questions

Pre-Questions - Experiment: Taking Crucibles to Constant...

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Experiment: Taking Crucibles to Constant Weight 1 What is the deadline for finding the constant weight of empty (clean) crucibles? 2. List all glassware or equipment that you will use in this experiment. 3. Why do you need to put the hot crucibles into the desiccator before you weigh them? 4. What does “ a precision of +/- 0.1 mg” mean? 5. What does “constant weight” mean? 6. Draw a flow chart for this experiment. Experiment: Review of Laboratory Techniques 1. According to the manual, what is an important component of both volumetric flasks and weighing bottles? 2. What is density? 3. How do you use density to calculate volume? 4. What do “ppt” and “ppm” stand for? 5. What does “weight by difference to get a 0.4 grams sample with a precision of 0.1 mg” mean? 6. Draw a flow chart for this experiment. Experiment: Gravimetric Determination of Nickel by Homogeneous Precipitation with Dimethylglyoxime 1. What type of glassware or tools will you use in this experiment? (maybe more than one, circle all possible) Beaker Erlenmeyer Flask Volumetric flask Glass rod Rubber police 2. What color is the precipitate? Green Gray Red Blue Black
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3. What organic reagent will you add to the nickel solution? EDTA DMG Water Ammonia Cu 4. What is the pH of the solution? pH > 7
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Pre-Questions - Experiment: Taking Crucibles to Constant...

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