2.40C: Describe an Experiment to Prepare a Pure, Dry Sample of a Soluble Salt, Starting from an Acid and Alkali

PREPARATION OF A SOLUBLE SALTS:

s

USING DILUTE ACID AND ALKALI:

s

PREPARATION OF SOLUBLE SALTS - METHOD 1

Diagram showing the Heating of Mixture to Leave a Saturated Solution

METHOD: Use pipette to measure Alkali into conical flask and add a few drops of indicator (Phenolphthalein or Methyl Orange) Add acid into burette and note the starting volume Add acid in burette into alkali in flask until indicator changes to appropriate colour Note and record the final Volume of acid in burette and calculate the volume of acid added (starting volume of acid - final volume of acid) Add this same volume of acid into the same volume of alkali without the indicator Heat to partially evaporate into saturated Solution Leave to crystallise Excess solution is decanted and crystals are blot dry