Conductivity of Solutions of Procedure: Use of the Conductivity Meter: Probe: Th

Question

Conductivity of Solutions of Procedure: Use of the Conductivity Meter: Probe: The probe is connected by a cable to the meter. It is sitting in a test tube of deionized water. The probe should not be allowed to dry out. Between measurements, the probe should be placed in a test tube of deionized water. The probe has been standardized prior to lab by a lab technician or your instructor. Do not press any buttons on the conductivity meter. It is already set up to make conductivity To make a measurement, put the solution to be tested into a test tube or small beaker. Liquid must be deep enough to cover the holes near the bottom of the probe. Place the probe into the liquid so that the liquid goes into the holes. Wait until the reading is stable. Record the reading. Suggested rinsing procedure: After making a conductivity measurement, it is important to thoroughly rinse the probe before going on to the next measurement. Get a large beaker and fill it half full with tap water. After making the conductivity measurement, put the probe in the water and gently stir. Then, use your deionized water bottle to thoroughly rinse the tip of the probe (rinse through the hole on the side of the probe case near the tip). Touch gently to a Kimwipe to blot. Do not wipe. Go on to the next measurement or put the probe back in deionized water Readings: Conductivity will be measured in units of Siemens per centimeter (S/cm). The meter's digital display will show a number and a unit, probably either microSiemens (uS/cm) or milliSiemens (mS/cm). Record all measurements in units of S/cm (for exam ple: 12.44 ms/cm-12,440 ?S/cm). Use the following ranges to classify substances: Conductivity less than 200 uS/cm 200-2000 pS/cm greater than 2000 ?S/cm Electrolyte Type non-clectrolyte weak electrolyte strong electrolyte At the end of the experiment, thoroughly rinse the probe and put it in a test tube with deionized water. The conductivity reading must be less than 30 uS/cm. Page 77 11 I ahoratory Manual - 2016

Explanation / Answer

II A) HCl reacted more rapidly.

B) Conductivity of HCl is more than acetic acid

C) HCl is strong electrolyte and hence is more reactive. Being strong electrolyte it dissociated more than acetic acid and hence the conductivity is more

III. A. Conductivity of acetic acid is 527.5 Micro siemen/cm(as recorded in your book)

Conductivity of ammonia 1470 microS/cm

You have not recorded the conductivity of mixture

Reaction: 2CH3COOH + NH3 --> 2CH3COONH4 + N2

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