Chapter+14+Lab

Reaction Rate Laboratory Name ____________________________________    Starch turns dark blue in the presence of I 2 molecules. We will use this color change to time reactions at various concentrations to find the affect concentration on a reaction. The reaction that is being carried out is more complex than those that we have covered in class, but that is not important. By varying the concentrations of the reactants of the reaction, we will be able to determine the general affect that it has on reaction rate.   Beakers 50 mL 10 mL graduated cylinder  Distilled water 25 mL graduated cylinder Clock with second hand  Solution A(Na 2 S 2 O 4 and starch) in spray bottle Solution B(KIO 3 ) in spray bttle   For this experiment we will **ALWAYS** use 10 mL of solution A, measured in the 25 mL Graduated cylinder.  In the 10 mL graduated cylinder will **ALWAYS** have 10 mL os solution and water before we mix them.   **Number of mL of solution B ** || **Number of mL of water ** || **Time in seconds ** || <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">10 || <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">0 || <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> || <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">9 || <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">1 || <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> || <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">8 || <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">2 || <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> || <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">7 || <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">3 || <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> || <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">6 || <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">4 || <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> || <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">5 || <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">5 || <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> || <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">4 || <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">6 || <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> || <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">3 || <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">7 || <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> || <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt; mso-bidi-font-weight: bold;">1. There are warmed solutions of A and B in the front of the room. Get 10 mL samples of each. Return to your desk and time how long it takes for them to react. Do not let them cool too much before you time them. <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt; mso-bidi-font-weight: bold;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt; mso-bidi-font-weight: bold;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt; mso-bidi-font-weight: bold;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt; mso-bidi-font-weight: bold;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt; mso-bidi-font-weight: bold;">2. There are solutions of A and B on ice in the front of the room. Get 10 mL samples of each. Return to your desk and time how long it takes for them to react. Do not let them warm too much before you time them. <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt; mso-bidi-font-weight: bold;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">Questions: <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">1. What happens to the reaction rate as the amount of solution B is decreased? <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">2. Why does changing the amount of solution B change the rate of the reaction? <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">3. What would happen if you decreased the amount ofsolution A? <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">4. What effect did changing the temperature have on the rate of reaction? <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">5. Why does changing the temperature effect the rate of reaction?
 * <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">Objective **<span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">: To determine the affect of concentration on the rate of a chemical reaction.
 * <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">Materials and equipment: **
 * <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">Safety: **<span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> The solutions in this lab are poisonous. There are to be no games played in the laboratory, do not squirt the bottles! You **MUST** wear your goggles and aprons at all times. Wash your hands before leaving.
 * <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">Procedure **<span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">:
 * <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">1. **<span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> Measure out 10 mL of Solution A in the 25 mL graduated cylinder.
 * <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">2. **<span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> Put 10 mL of solution B in the 10 mL graduated cylinder
 * <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">3. **<span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> Pour the two solutions together, and time how long it takes for the color to appear. Record in the data table.
 * <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">4. **<span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> Clean the beaker.
 * <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">5. **<span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;"> Repeat steps 1 through 4, using 9 mL of solution B, and 1 mL of water in the 10mL graduated cylinder.
 * <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">6. **<span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">For the rest of the experiment, repeat steps 1-4, using one mL less of solution B each time, and one mL of distilled water
 * <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">Data Table: **<span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">
 * <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">Part B **
 * <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">The effect of temperature: **
 * <span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">Conclusion: **<span style="font-family: 'Century Schoolbook','serif'; font-size: 11pt;">