lab report for Exp: Electrical Conductivity of Aqueous Solutions Ill. Conclusion
ID: 1031014 • Letter: L
Question
lab report for Exp: Electrical Conductivity of Aqueous Solutions
Ill. Conclusion What can one conclude about the electric conductance of aqueous solutions? Based on the results in Part A, what can be inferred from the electrical conductance of solid compounds, weak electrolytes and strong electrolytes? What factors affect the ability of these tested substances to conduct electricity? Based on the results in Part B, what can be inferred from the use of electrical conductance 1. 2. 3. 4. 5. 6. 7. as evidence of a chemical reaction? How does the conductivity test prove the occurrence of a chemical reaction? What lab techniques were learned in this experiment? How can the concepts and techniques explored in this experiment be practically applied?Explanation / Answer
1:) Electrical Conductance of aqueous solutions: Electrical conductance of solutions means how the flow of electron is happening in a solution. or it is a measure of ability to conduct electricity. if in solution if there will be ions present they will pass the electrons from one electrode to another electrode. so it means that solution conductance depends on the number of ions present. So as we know that distilled water contains very less number of ions so it conducts very little electric current. on the other hand, if a strong electrolyte like NaCl is dissolved in water, this aqueous solution will contain a very large number of ions which can flow the electric current. So aqueous solution with a number of ions present will be conducting solution.
2: Electrical Conductance of Solid, Weak Electrolyte, and Strong electrolyte.
As discussed above also, the conductivity of a material represents how easily charges will flow through a material. In solids like metals presence of motion of valence electrons due to electric current. so such kind of solid could easily flow the electric current.
in case of weak electrolyte, they are not fully dissociated in respective ions. Usually, weak electrolytes are in a mixture of ions and undissociated molecule in equilibrium. So in solution, the presence of the number of ions is low so it will conduct a little low electric current.
in case of strong electrolyte, a complete dissociation occurs in aqueous solution. so the presence of the number of ions is high so it will conduct electric current high.
3: Discussed above
4:&5:
Electrical conductance could indicate how a chemical reaction is happening. Let's take one example of Acid-Base Titration. Lets in the solution we have 10 molecules of HCl (Strong) and we are titrating with a strong base(NaOH). so initially there will be 20 number of ion present in aqueous solution. now if I add one molecule of NaOH, in solution there will be 9 HCl, 1 NaCl, and water molecules. so total number of ions will be 20. if I add 5 molecules of NaOH, the solution will contain 5 molecules of HCl and 5 molecules of NaCl, the total number of ion will, 20. Now if I add 10 molecules of NaOH, there will be 20 ions. Now if i add 11 number of NaOH there will be 10 number of NaCl molecule with 1 NaOH molecule. so total number of ions will be 22.
so from this, we could find the exact neutralization point. of that acid.
On the other hand, we could also measure a chemical reaction is happening or not through checking conductance if there will involvement of some ionic compounds.
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