Wellplate Watch Glass Cut the chromatography paper into a 3 inch piece.
Capacitors A capacitor has the ability to store charge. However, since the charges must flow through the resistor, R, the charging does not occur instantaneously. A graph of this function of charge vs.
The characteristic decay time is again given by RC. A single-pole, double throw switch is also included. When the switch is in position a, the charge on the capacitor and hence the voltage across the capacitor increases with time.
After the capacitor is fully charged, the switch is moved to position b, and the charge on the capacitor and hence the voltage across the capacitor will decrease with time. An inductor is a coil of wire that opposes changes in the current.
The amount of resistance to change in current depends on a parameter called the inductance, L, which depends on the number of turns and geometry of the coil. Figure 4a shows an inductor, resistor and voltage source connected in series. The current as a function of time is given by: Capacitors in Series and Parallel Figure 5: Series Using the capacitance meter, measure directly the capacitance of each of the two capacitors in the circuit board.
Connect the two capacitors on the circuit board in a parallel arrangement see Figure 5and measure the total capacitance. Connect the two capacitors in a series arrangement see Figure 6and measure the total capacitance.
Calculate the expected capacitances of the two configurations using eqs, 1 and 2. Determine the percentage error between calculated and measured values. Set up the circuit as in Figure 7.
Be sure the lab instructor or TA checks the circuit before you turn the power on! Note that the probes to Channel A of the Science Workshop Interface are set to measure voltage which is proportional to charge across the capacitor.
Connect the red lead from the red plug on the power supply to one side of the switch. Connect the bottom end of the capacitor to one end of the resistor, as shown, and connect the other end of the resistor to the middle of the switch.
Once your circuit has been checked, turn the voltage source up to about 8 V. Do not exceed 10 V. Open Data Studio and click Create Experiment. Click on Channel A and select Voltage Sensor from the list. Set the stop time to 5 seconds. Open a Graph display by double clicking on the Graph icon in the left column.
The graph should look similar to that of Figure 1b. Select the best data and fit it to an inverse exponential curve. Paste a copy of your graph in your e-journal.Chromatography Lab Answers Purpose The purpose of the experiment is to determine the specific types of pigments found in a beet leaf and in a spinach leaf by using paper chromatography and two solvents: water soluble solvent and lipid soluble solvent.
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