Question

how do i do standard deviation for boyle's law lab

Answer 1

We must emphasize that this gas law is ideal. As students, professors, and chemists, we sometimes need to understand the concepts before we can apply it, and assuming the gases are in an ideal state where it is unaffected by real world conditions will help us better understand the behavior the gases. In order for a gas to be ideal, its behavior must follow the Kinetic-Molecular Theory whereas the Non-Ideal Gases will deviate from this theory due to real world conditions.

Robert Boyle, a British chemist, was one of the first to study gases quantitatively. In one set of experiments, Boyle established a relationship between the pressure and volume of a gas at constant temperature. He found that at a constant temperature, the volume (V) occupied by a definite mass of gas is inversely proportional to the applied pressure (P). This is known as Boyle's Law. Mathematically, this relationship can be stated as follows: V " 1/P The symbol """ means "is proportional to." Boyle's Law may be restated as: for a given amount of gas at a constant temperature, the product of the pressure and the volume is a constant. If we replace the proportionality constant in the previous equation with a constant of proportionality, we will obtain another form of Boyle's Law. V = k (1/P) or PV = k We will see how this is derived experimentally in today’s experiment.

You will use a large, 60 ml syringe to measure the volumes for this experiment, and to generate the pressures as shown in Figure 2. Attached to the syringe by a short piece of Tygon tube will be a Y or T tube, which will also have short pieces of Tygon tube attached to the remaining openings of the tube. This will be attached to the pressure sensor as described below for measuring the pressure. The open end of the Y tube should either have a valve or have a screw clamp to facilitate isolation from atmospheric pressure. Pressure sensor set-up 1. Read the atmospheric pressure from the barometer, convert from inches to torr if necessary and record the value in torr as Patm in step 6 on the following page. 2. Adjust the plunger of the syringe to 30 ml attach the Lure lock end to the presser sensor connection on the back of the MicroLAB, then tighten the screw clamp to completely close off the opening of the tubing. Note: The volume of the Y tube system is approximately 3 mL, this must be added to the total volume reading on the syringe on each of the following readings. 3. Before starting data collection, you should check that the pressure being measured by the MicroLAB is the same, within a percent or two, as the pressure you determined from the barometer. If it is not, consult with your instructor.

and collect the datas as required.