QUESTION 1 Which of the following reactions would be suitable for analysis by co
ID: 636239 • Letter: Q
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QUESTION 1 Which of the following reactions would be suitable for analysis by conductometry? (Select ll that apply) a. solutions of copper(II) nitrate and sodium sulfate b. aluminum metal and nitric acid solution c. solutions of sodium hydroxide and phosphoric acid c, d, octane and propanol e. solutions of potassium chloride and lead(II) nitrate QUESTION 2 Conductance of any solution is dependent on the total value of charge in solution. True False QUESTION 3 Water is a highly conductive materialExplanation / Answer
Answer 1: For suitable conductometry, the following conditions are preferred:
1. strong acid and strong base
2. weak acid and strong base
3. strong acid with weak base
4. weak acid with weak base.
So the options to be selected are b and c , because for the remaining the reactants combination, they are either salt or flammable compounds.
Answer 2: Conductance is the property opposite to resistance , i.e id denotes the ease by which electrons can flow within the solution.For any solution to conduct electricity, it requires free electrons or the transfer of the ions. The conductance in an electrolytic solutions depends on: (i) the nature of the electrolyte added (ii) size of the ions produced and their solvation (iii) the nature of the solvent and its viscosity (iv) concentration of the electrolyte (v) temperature (it increases with the increase of temperature). So, in my opinion, the conductance depends on the free charge or free ions present rather than the total value of charge.The electrical conductance of a solution is a measure of its currents carrying capacity and therefore determined by the total ionic strength. So the statement is TRUE.
Answer 4: Conductometric analysis is mostly done by the conductometric titration and conductometric titrations, in which the species in the solution are converted to non-ionic for by neutralization, precipitation, etc. are of more value.The end point in this titration is easily determined. There are numerous examples of precipitate forming, one such example is titration of KCl by AgNO3. So the above statement is TRUE.
Answer 5: Conductivity Probe - contains two parallel electrode.
Graphite - chemically inert.
Alternating current - reversal of polarity after each cycle.
Hydrochloric acid - experimental titrant
Sodium Carbonate - massed into a beaker.
The vernier Conductivity probe contains two electrode in which the electricity is applied to know the conductance of the solution.
Graphite is unreactive, since the carbon atoms are tightly bound, hence its inert.
As the name suggests, alternating means changing so electric charge in alternating current (AC),changes direction periodically.
Hydrochloric acid is the most used titrant in titration.
Sodium carbonate is a white powdery substance usually massed in a beaker.
Answer 6 : The SI unit of conductance is Siemens. represented by the symbol ‘S’ and is equal to ohm-1 (also known as mho). It si at someplaces also represnted by 'G'.
G= 1 / R = I / V ; R is resistance, I is current, V is potential difference.
Answer 7 : The correct procedure should be:
b. Immediately rinse the affected area with water.
( since it shows a bullet check option i am going with a single option, in case of multiple options there can be multiple options)
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