Chemistry Practical: Finding the water content of Na2 CO3 .xH2O by Titration

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Sodium Carbonate Titration        08/05/2007        

Chemistry Practical: Finding the water content of Na2 CO3 .xH2O by Titration

Method

Step 1: making up the solution

  1. Weigh about 4g of sodium carbonate hydrate crystals into a dry weighing bottle. Place bottle, lid and powder onto the balance and weigh using an accurate balance to record weight to 3 d.p. Note: remember not to expose crystals to air for too long to avoid water loss from crystals.
  2. Transfer the powder to a beaker (100 ml+ in size)
  3. Reweigh the bottle and lid (and subsequently any powder left in the bottle that didn’t fall out). Hence find the weight of sodium carbonate transferred to the beaker by subtracting it from the weight of the bottle, lid and powder.
  4. Dissolve the powder in distilled water by stirring the solution.
  5. Transfer the solution to a 250cm3 volumetric flask washing the beaker out with distilled water into the flask to ensure as much of the solution is washed into the flask as possible.
  6. Add distilled water to the solution to make it up to 250cm3 ensure exactly the correct amount is in the flask and that the bottom of the meniscus rests on the calibration mark.
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Stage 2: titration

  1. Wash out:
  1. the pipette, with a little of the sodium carbonate solution
  2. the burette, with a little of the hydrochloric acid solution
  3. the conical flask, with a little distilled water.
  1. Fill the burette with the hydrochloric acid solution, running some   of the solution through the tap, until the bottom of meniscus is just on the zero level. Ensure that there is no air bubbles trapped.
  2. Using the pipette filler place 25cm3 of the sodium hydroxide solution in the clean conical flask.
  3. Add 4 or ...

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