Rainbow Density Lab

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iv. Add the amount of salt specified in the Solution Chart to the beaker. Adjust the triple beam balance until the desired mass is obtained (This is the mass calculated in step ii). v. Use water from your sink and obtain 25 mL of water, measured in the graduated cylinder. vi. Pour the 25 mL of water into the beaker that has the salt in it. Stir the solution until the salt is completely dissolved. vii. Mass the beaker with the salty water in it. Record the mass in the data table. viii. Repeat steps ii-v for Solution B and Solution C, using the different beaker each time. VI. Discussion Questions: a. Day 1: i. How do the volumes of the solutions compare to one another? Does adding different amounts of salt increase the volume at different levels? ___________ ___________________________________________________________________ ___________________________________________________________________ ii. How do the masses of the solutions compare to one another? ________________ ___________________________________________________________________ ___________________________________________________________________ iii. Calculate the density of each solution. Find the mass of the solution from the Data Table, in the column labeled “Mass of Salt and Water.” Find the volume of the solution from the “Solution Chart” on page 1. Solution <strong>Density</strong> (<strong>Density</strong>= Mass/Volume) A B C iv. Predict what you think will happen if the solutions were put into a test tube. If Solution A was red, Solution B was yellow, and Solution C was blue, draw what you think the test tube would look like. ____________________________ ___________________________________________________________________ 2 
VII. ________________________________________________________ Procedure a. Day 2: i. Obtain 10 mL of Solutions A, B, and C. Measure out the 10 mL in the smallest graduated cylinder then three small beakers. ii. Pipette 2 full pipettes of each liquid into one test tube as instructed by your teacher at the beginning of the period. Do this in the following order: Blue, Yellow, and then Red. iii. Make a drawing of the test tube once you have completed your pipetting (do this in the space provided in the data section of this lab packet). VIII. Data: a. Data Table: Solution Mass of Salt Mass of Beaker Mass of Beaker and Salt Mass of Beaker and Salt and Water Mass of Salt and Water A 0.5 g B 1.0 g C 1.5 g b. Test Tube Drawings Solution A (Red) Solution B (Yellow) Solution C (Blue) 3 
Page 1: Name: _____________________________

Rainbow Density Lab

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