Procedure A Effect Of Concentration 1 Before Coming To Lab Complete The Initial Concentration Table Below Showing All 1 (59.17 KiB) Viewed 57 times
Procedure A Effect Of Concentration 1 Before Coming To Lab Complete The Initial Concentration Table Below Showing All 2 (62.08 KiB) Viewed 57 times
Procedure A-Effect of Concentration: 1. Before coming to lab, complete the initial concentration table below showing all work. Initial concentrations are not the concentration of the solutions you start with (i.e. not 0.050M for I and H2O2). Initial concentrations are the concentration of species in the final total volume of contents of the Erlenmeyer plus beaker for each run (see tables in steps 4 & 6). Determine initial concentrations using the formula MV, M,V2. M and V, are the molarity and volume of the solutions added, V2 is the total volume of the Erlenmeyer plus beaker. Copy these initial values onto the table in the data sheet. Run 11"(initial) 14,0,1 (initial) - 1 (Flask 1 + beaker 1) (15.0 mLX0.050M) - (42.5 ml)(M) Solving for M, we get [1] (initial)-0.018 M 2 (Flask 2 + beaker 2) 3 (Flask 3 + beaker 3) 2. Clean and mostly dry three Erlenmeyer flasks. Label them 1, 2 and 3.
a 3. Obtain a bin of chemicals for your group. Use only these chemicals for all of your runs. Use fresh pipettes for each solution. Rinse pipette twice with the solution that you will be measuring and keep this prepared pipette with the corresponding solution. 4. Add the amounts of the solutions below to prepare each flask. The chemicals must be added in the order listed (top to bottom). Flask #1 Flask #2 Flask #3 10.050 M KI 15.0 ml 15.0 mL 7.5 mL 1% Starch 5.0 ml. 50 ml. 5.0 mL 0.010 M Na,s,o, 2.5 ml 2.5 ml 2.5 mL 1 MH,SO 5.0 ml 5.0 mL 5.0 mL 0.050 M NaCI 0 0 7.5 mL Note: The NaCl solution is added so that the ionic strength of and volume of each solution is the same. 5. Rinse and mostly dry 3 beakers and label as 1, 2 and 3. 6. Prepare the following solutions in clean beakers: Beaker #1 Beaker #2 Beaker #3 0.050 MH,O2 15.0 mL 7.5 mL 15.0 mL Deionized H.O 7.5 mL 0 Note: deionized water are added so that the total volume of each run is the same. (42.5 mL) 0
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