Ions in solution cany current from one electrode to the other. The amount of cur

Question

Ions in solution cany current from one electrode to the other. The amount of current depends on the concentration and charge of the ions present. The instructor will demonstrate solution conductivity. The conductivity apparatus is essentially a light bulb with a broken wire When the circuit is completed, the light bulb will light. You can judge die conductivity of the solution by die brightness of the bulb Fill in the table below, placing an X in the appropriate column for each substance tested. For conductors, write the formulas and charges of the ions responsible for the conductivity. Heat of solution Place a scoop of each of the following substances in a test tube Holding the test tube by the bottom so you can feel temperature changes more readily, add 2 mL of distilled water to each tube, shaking gently until the salt is dissolved. Insert a thermometer gently and note any changes of temperature that occur.

Explanation / Answer

For the given substances we can classify them as,

Substance

distilled water : Polar : Non-electrolyte

Tap water : Polar : Weak electrolyte : Ca2+, Mg2+, etc.

Solid sugar : Polar : Non-electrolyte

Sugar solution : Polar : Non-electrolyte

solid NaCl : Ionic : Non-electrolyte

NaCl solution : Ionic : Strong electrolyte : Na+ and Cl-

Distilled HC2H3O2 : Polar : Weak electrolyte : C2H3O2- and H+

1 M NH4OH : Ionic : weak electrolyte : NH4+ and OH-

1 M NH4OH + dil HC2H3O2 : Ionic : weak electrolyte : NH4+ and C2H3O2-

1M NaOH : Ionic : Strong electrolyte : Na+ and OH-

1 M HCl : Polar : Strong electrolyte : H+ and Cl-

1 M CuSO4 : Ionic : Strong electroyte : Cu2+ and SO4^2-

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