4. At this point it is necessary to simultaneously moisten the cotton plug on one end of the tube with concentrated HCI, and the plug on the other end with concentrated NH3. Draw some concentrated HCl into one dropper and some concentrated NHs into another dropper. Each team member take one dropper and hold it near the cotton plugs at the opposite ends of the tube. Simultaneously touch the droppers to the respective plugs and carefully squeeze enough liquid onto the plugs to just moisten them. No liquid should be visible in the glass tube beyond the cotton plugs. If liquid is visible, the glass tube must be cleaned and dried, and the experiment repeated.
Ideal and Real Gases
Ideal gases obey conditions of the general gas laws under all states of pressure and temperature. Ideal gases are also named perfect gases. The attributes of ideal gases are as follows,
Gas Laws
Gas laws describe the ways in which volume, temperature, pressure, and other conditions correlate when matter is in a gaseous state. The very first observations about the physical properties of gases was made by Robert Boyle in 1662. Later discoveries were made by Charles, Gay-Lussac, Avogadro, and others. Eventually, these observations were combined to produce the ideal gas law.
Gaseous State
It is well known that matter exists in different forms in our surroundings. There are five known states of matter, such as solids, gases, liquids, plasma and Bose-Einstein condensate. The last two are known newly in the recent days. Thus, the detailed forms of matter studied are solids, gases and liquids. The best example of a substance that is present in different states is water. It is solid ice, gaseous vapor or steam and liquid water depending on the temperature and pressure conditions. This is due to the difference in the intermolecular forces and distances. The occurrence of three different phases is due to the difference in the two major forces, the force which tends to tightly hold molecules i.e., forces of attraction and the disruptive forces obtained from the thermal energy of molecules.
8. Suppose in Step 4 of the Graham's law experiment one of the partners moistened the cotton on the NH3 end of the tube several seconds before the cotton on the other end was moistened. How would this mistake influence the calculated experimental value of the ratio (rate NH3)/(rate HCl)?
a. Increase it
b. Decrease it
c. Would have no effect
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