2.3: Procedures
- Page ID
- 379577
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\(\newcommand{\avec}{\mathbf a}\) \(\newcommand{\bvec}{\mathbf b}\) \(\newcommand{\cvec}{\mathbf c}\) \(\newcommand{\dvec}{\mathbf d}\) \(\newcommand{\dtil}{\widetilde{\mathbf d}}\) \(\newcommand{\evec}{\mathbf e}\) \(\newcommand{\fvec}{\mathbf f}\) \(\newcommand{\nvec}{\mathbf n}\) \(\newcommand{\pvec}{\mathbf p}\) \(\newcommand{\qvec}{\mathbf q}\) \(\newcommand{\svec}{\mathbf s}\) \(\newcommand{\tvec}{\mathbf t}\) \(\newcommand{\uvec}{\mathbf u}\) \(\newcommand{\vvec}{\mathbf v}\) \(\newcommand{\wvec}{\mathbf w}\) \(\newcommand{\xvec}{\mathbf x}\) \(\newcommand{\yvec}{\mathbf y}\) \(\newcommand{\zvec}{\mathbf z}\) \(\newcommand{\rvec}{\mathbf r}\) \(\newcommand{\mvec}{\mathbf m}\) \(\newcommand{\zerovec}{\mathbf 0}\) \(\newcommand{\onevec}{\mathbf 1}\) \(\newcommand{\real}{\mathbb R}\) \(\newcommand{\twovec}[2]{\left[\begin{array}{r}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\ctwovec}[2]{\left[\begin{array}{c}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\threevec}[3]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\cthreevec}[3]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\fourvec}[4]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\cfourvec}[4]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\fivevec}[5]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\cfivevec}[5]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\mattwo}[4]{\left[\begin{array}{rr}#1 \amp #2 \\ #3 \amp #4 \\ \end{array}\right]}\) \(\newcommand{\laspan}[1]{\text{Span}\{#1\}}\) \(\newcommand{\bcal}{\cal B}\) \(\newcommand{\ccal}{\cal C}\) \(\newcommand{\scal}{\cal S}\) \(\newcommand{\wcal}{\cal W}\) \(\newcommand{\ecal}{\cal E}\) \(\newcommand{\coords}[2]{\left\{#1\right\}_{#2}}\) \(\newcommand{\gray}[1]{\color{gray}{#1}}\) \(\newcommand{\lgray}[1]{\color{lightgray}{#1}}\) \(\newcommand{\rank}{\operatorname{rank}}\) \(\newcommand{\row}{\text{Row}}\) \(\newcommand{\col}{\text{Col}}\) \(\renewcommand{\row}{\text{Row}}\) \(\newcommand{\nul}{\text{Nul}}\) \(\newcommand{\var}{\text{Var}}\) \(\newcommand{\corr}{\text{corr}}\) \(\newcommand{\len}[1]{\left|#1\right|}\) \(\newcommand{\bbar}{\overline{\bvec}}\) \(\newcommand{\bhat}{\widehat{\bvec}}\) \(\newcommand{\bperp}{\bvec^\perp}\) \(\newcommand{\xhat}{\widehat{\xvec}}\) \(\newcommand{\vhat}{\widehat{\vvec}}\) \(\newcommand{\uhat}{\widehat{\uvec}}\) \(\newcommand{\what}{\widehat{\wvec}}\) \(\newcommand{\Sighat}{\widehat{\Sigma}}\) \(\newcommand{\lt}{<}\) \(\newcommand{\gt}{>}\) \(\newcommand{\amp}{&}\) \(\definecolor{fillinmathshade}{gray}{0.9}\)Experimental Procedures
Teams of 2-3 individuals will work cooperatively to perform this experiment and fill out the solubility lab datasheet. Before leaving the lab they need to write their name on the sheet and get the instructor's dated signature. The instructor needs to take a photo of a completed datasheet before group members leave.
- Weigh about 4.2 grams of KClO3 record this mass to the 0.0001 g in your datasheet.
- Quantitatively transfer the KClO3 to the 8 inch test tube
- Calculate the volume of DI (Deionized) water you would need to add to that mass to make a solution that is approximately 28% KClO3 by mass. Assume the density of pure water to be 1.000 g/mL.
- Using a burette transfer around that volume of water to the 8 in test tube containing the KClO3. Record in the datasheet the exact volume of water transferred.
- Place the four small test tubes in a rack,
- wet them with DI
- empty them like you would if you were pouring them into the large test tube
- fill a 250 mL about 70% full with DI water
- using a 5 mL pipette transfer 5.00 mL of the DI water from the beaker to each test tube in the rack.
- Place about 300 ml of water in a 500 mL beaker and heat to approximately 90o C. Make sure to inspect the electrical line and keep it from touching the hot surface. You will use this water bath to heat your solution.
- Place a notched stopper through which is suspended a thermometer probe and a wire stirrer, into the mouth of the test tube as shown in figure \(\PageIndex{1}\). Lower the tube into the hot water bath and stir the contents with the wire stirrer until the crystals have all dissolved. Remove the tube from the water bath and allow the contents to cool while continuing to stir the mixture. Carefully observe the contents of the tube while cooling is occurring and note and record the temperature at which crystals first appear.
- Add additional 5 mL of water and continue cooling if crystals dissolve upon dilution. If they do not dissolve, place back in water bath until they dissolve. If you do this step rapidly the solution will not have cooled enough to be saturated and they will not need to be reheated.
- Repeat steps 5 and 6 until you have recorded data for a total of 5 solutions, recording all values in your data sheet.