Question

Experiment D: Conductivities of Solutions Purpose: To record the conductivity of each solution of ammonia, vinegar, calcium hydroxide, sodium bicarbonate, sodium chloride, and rubbing alcohol, using the conductivity apparatus. 0 Energizer On/Off Button On/Off Switch Conductivity Apparatus Notice on the circuit board that there is a button or switch to turn on/off the apparatus and two LEDs 9 (light emitting diodes). One LED will light up red and the other will light up green. If there is a yellow button, push it down to turn the apparatus on or off; if there is a switch, slide it towards the battery to turn the apparatus on and slide it towards the two wires to turn the apparatus off. To make sure that the apparatus is working properly, turn it on and touch the two wires to a kitchen knife. Both LEDs should glow brightly because a metal is a good conductor of electricity. Into each of the solutions prepared in Expt. C dip the two wires and note the colors of the LEDs. Make sure you only dip the wires in the solution. Do not dip the entire apparatus in the solution. If neither of the LEDs lights up, then the solution does not conduct a current. That means there are no ions present in the solution; and the solution is a nonelectrolyte. If only the red LED glows faintly, as you would observe for tap water, then only a few ions are present in solution and therefore the solution is a weak

Answer 1

Phenolpthalein colour Red lithmus colour. Blue lithmus colour. Acidic, Basic or neutral. universal indicator colour pH conductivity

Ammonia pink blue blue basic   

greenish blue ~8 weak

Vinegar colourless red red acidic

orange ~6 weak

Calcium hydroxide pink blue blue basic

blue ~11. strong

sodium bicarbonate pink blue blue basic

blue ~12 strong

sodium chloride no effect no change no change neutral

green 7 strong

Rubbung Alcohol colourless red red acidic

bluish green ~9 weak