User manual HANNA INSTRUMENTS HI 3843

[. . . ] Instruction Manual Specifications Range 50 to 150 g/L as Chlorine (Cl2) Smallest Increment 5 g/L (0. 5%) as Chlorine (Cl2) Analysis Method Iodometric method- Titration Sample Size 1 mL Number of Tests 100 (average) Case Dimensions 235x175x115 mm (9. 2x6. 9x4. 5") Shipping Weight 485 g (17. 1 oz. ) Instructions READ THE ENTIRE INSTRUCTIONS BEFORE USING THE KIT · Fill the Erlenmeyer flask with about 70-75 mL of tap water (the residual chlorine in the tap water will not affect the test). · Add 6 drops of Potassium Iodide Solution and swirl gently to mix. · Slowly add drops of HI 3843C-0 Bleach Reagent while swirling after each drop and counting the drops until the solution changes from yellow to colorless. [. . . ] After adding this reagent to your sample and mixing, check the pH of the solution in the Erlenmeyer flask: the pH should always be below 3. Otherwise, add packets of HI 3843B-0 reagent, one at a time, until the pH value drops below 3. # of DROPS * 0. 5 = % Chlorine · The result obtained can also be expressed in g/L by multiplying the % number by 10. www. hannainst. com REFERENCES Bibliography Vogel's, Textbook of quantitative Chemical Analysis, 5th ed. Longman scientific & technical. 09/03 Dear Customer, Thank you for choosing a Hanna Product. Please read the instructions carefully before using the chemical test kit. It will provide you with the necessary information for correct use of the kit. Remove the chemical test kit from the packing material and examine it carefully to make sure that no damage has occurred during shipping. If there is any noticeable damage, notify your Dealer or the nearest Hanna office immediately. Each kit is supplied with: · Potassium Iodide Solution, 1 bottle with dropper (30 mL); · HI 3843B-0 Bleach Reagent, packets (100 pcs); · HI 3843C-0 Bleach Reagent, 2 bottles with dropper (60 mL); · 1 glass Erlenmeyer flask (125 mL); · 25 plastic pipettes (1 mL). Note: Any damaged or defective item must be returned in its original packing materials. Chemical Reaction The available chlorine refers to the chlorine liberated by the action of dilute acid on the hypochlorite: OCl - + Cl - + 2H + = Cl 2 + H 2 O An iodometric titration method is used in this test kit. The hypochlorite solution is treated with potassium iodide and strongly acidified with acid (Step 1). [. . . ] The chemicals contained in this test kit may be hazardous if improperly handled. Read Health and Safety Data Sheets before performing the test. ISTR3843R2 Note: Use the plastic pipettes for about 5 times each, rinsing them with tap water after every test. [. . . ]