Data Analysis Part 1: Classifying solutions as Strong, Weak, or Non-electrolytes
ID: 939897 • Letter: D
Question
Data Analysis Part 1: Classifying solutions as Strong, Weak, or Non-electrolytes 1. The conductivity sensor measures a maximum conductivity of 100,000uS/cm. How does this does this information affect the results obtained? Compare the conductivity of tap water with deionized water 2. a. b. What is the difference between these two solutions from a chemical standpoint? How does this difference contribute to the conductivities of each solution? 3. Compare the conductivity of glacial acetic acid and dilute acetic acid a. b. What is the difference between these two solutions from a chemical standpoint? How does this difference contribute to the conductivities of each solution?Explanation / Answer
1) Polarization is one of the most important factors that can seriously influence the accuracy of conductivity measurements. It involves all the effects that occur at the metal liquid boundary when current flows are combined. These make the conductivity of the solution appear smaller and the cell constant appear larger. As measured towards higher conductivity values, the current has to increase in order to measure at the same voltage level. This leads to an «ioncloud» near the surface of the electrodes. This «ion cloud» is measured as an additional resistance resulting in an erroneous reading.
2) a. In deionized water the non-soluble salts are removed as in normal water the presence solid ions varies with water supply.
b. The conductance of tap water is high due to the presence of polrazing substance for example presence of small amount of sodium & chloride ions which favors the ionic conductance.
3) a. On comparing glacial acetic acid with dilute acetic acid is having only difference of water molecule presence in dilute state.
b. The presence of H+ ions in dilute acetic acid favors the conductance as its absence in glacial state, as we are aware that the pH influences the conductivity as its influenced by H+ ionic concentration.
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