Potassium Chloride
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SL. NO
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TESTS
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STANDARDS
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1
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Characters
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A
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Description |
Colourless crystals or a white, crystalline powder;
odourless. |
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B
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Solubility |
Freely soluble in water; practically insoluble in ethanol
and in ether. |
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2
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Identification
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A
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Reaction of Potassium salts | |||
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i
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Reaction A
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A yellow or orange-yellow precipitate should be formed
immediately. |
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ii
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Reaction B
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A white, crystalline precipitate should be formed.
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iii
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Reaction C
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A yellow, crystalline precipitate should be formed which
on ignition should leave a residue of potassium chloride and platinum. |
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B
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Reaction of Chlorides | |||
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i
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Reaction A
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A curdy white precipitate should be formed which should
be insoluble in nitric acid but soluble in dilute ammonia solution. |
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ii
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Reaction B
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The filter paper strip should turn violet-red.
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3
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Appearance of Solution
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Solution should be Clear and Colourless
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4
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Acidity or Alkalinity
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Not more than 0.5 ml of 0.01M hydrochloric acid or 0.01M sodium hydroxide should be required. |
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5
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Arsenic
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Not more than 1ppm.
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6
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Barium
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Solution should not be more opalescent.
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7
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Heavy Metals
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Not more than 10 ppm
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8
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Calcium & Magnesium
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Solution should remain clear.
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9
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Iron
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Not more than 20 ppm.
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10
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Bromide
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Not more than 0.1%
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11
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Iodide
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The substance should not show blue colour after 5 minutes.
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12
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Sulphate
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Not more than 300 ppm.
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13
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Loss on Drying
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Not more than 1.0%
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14
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Assay
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Between 99.0% and 100.5%
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