Essay on Conductivity Lab

1624 Words Oct 18th, 2012 7 Pages
Post-Lab Questions 1. Using the information provided in the Introduction and your observations from Part 1, hypothesize as to the type of electrolyte the following solutions would be. Justify the hypothesis from a chemical standpoint. a. Aqueous Sodium Hydroxide—NaOH (aq) is a very strong base, which will completely disassociate into Na+ and OH- ions, which would make it a very strong electrolyte. Chemical reaction of the disassociation of Sodium Hydroxide: NaOH (aq)Na+ (aq)+ OH-(aq) b. Aqueous NaCl—Sodium Chloride contains both sodium and chloride ions, but in the solid state they are locked in place and therefore unavailable to conduct electricity. But, when NaCl is dissolved in water, the ions are free to move and conduct …show more content…
What are the disadvantages? The benefits are a more precise numerical value that defines the conductivity at a given level. This way, accurate conclusions can be reached. The disadvantage is the limited measurements that can be used. This sensor reaches a maximum of 100,000 micro siemens per centimeter when measuring conductivity. This restricts the measurement of anything more conducive than this limit as seen with the hydrochloric acid. 6. Which technique (light bulb or conductivity sensor) provides you with the most accurate results? A conductivity sensor provides the most accurate results. The sensor retains the capability of measuring exact values for each substance, while the light bulb can only tell whether there is conductivity or not, and how weak or strong the conductivity may be. The sensor can measure the degree of conductivity rather than just admitting or negating its presence. 7. What are some sources of error associated with this experiment? How do they affect the results obtained? How could these errors be corrected in the future? Some sources of error associated with this experiment are: an unclear reading on the sensor, and a malfunction with the SPARK System. An unclear sensor reading can be corrected by properly cleaning any previous solution with the deionized water. To prevent malfunction with the SPARK, always inspect the machine before using it in any lab. Temperature can affect conductivity as well. For the best

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