We prepare a solution of Sodium Hypochlorite for purified water system. Is there any method to determine the strength of that solution.

Dear,

Calculate weight of molecules of H2O is 0.18.so there for

If your tank capacity is 1000 ltr then add NaOcl given below formula:

=0.18 X 1000

= 180ml

You can use his method without diluting.

Tare the weight of 250mL Volumetric

flask and transfer accurately 25mL of sodium hypochlorite solution

into it. Note the weight in gram. And dilute with distill water to

the volume. Transfer 10mL of the resulting solution into a

glass-stoppered flask, and dilute it with 50 mL of water. Add 2 g ofpotassium iodide and 10 mL of 6 N acetic acid, and titrate theliberated iodine with 0.1 N sodium thiosulphate VS, adding 3 mL of starch TS as the endpoint is approached. Perform a blank determination, and make any necessary correction. Each mL of 0.1 N sodium thiosulphate is equivalent to 0.0035455 g of available chlorine. Calculate the available chlorine using the following formula.

```
250 x V x N.F. x Specific factor x 100
```

Chlorine = -----------------------------------------------------------------

```
. WT (g) x 10
Where,
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