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Wednesday, January 26, 2011

Liquid Bleach Preparation

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 Preparation of Sodium Hypochlorite Solution
(Approximately 1% available chlorine)

Basis:  100 liter solution in plastic container
Chemicals required:  1.5 kg. calcium hypochlorite 70%
                                1.5 kg.  soda ash light powder

Other requirements:  Wooden paddle long enough to be used for mixing and stirring
                                Plastic siphon to be used for transferring solution
                                Hydrometer

Procedure:

  1. Mix the 1.5 kg. calcium hypochlorite 70% and 1.5 kg. soda ash light dry.
  2. Put 80 liters water in the plastic container direct from the faucet.
  3. Add the mixture slowly to the water while stirring, taking care to break any lumps of chemicals.
  4. Continue stirring for another 10 minutes.  Stand to settle at least 6 hours or overnight.
  5. Siphon or decant the solution to another plastic container.
  6. Add 20 liters of water to slurry left in the plastic container.  Continue stirring to dissolve further.  Stand for 1-2 hours.
  7. Siphon or decant the solution to the first solution avoiding the slurry not to be included.
  8. Get and record the sprcific gravity by the use of hydrometer. This is approximately equivalent to 1% available chlorine)
Standard                                              1% available chlorine                                10g/liter available chlorine
3:1 water                                                        0.75%                                                        7.5g/ltr
1:1 water                                                        0.50%                                                        5.0g/ltr

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