User manual HANNA INSTRUMENTS HI 3880

[. . . ] Instruction Manual SPECIFICATIONS Range 4. 0 to 6. 5 as pH unit Smallest Increment 0. 5 as pH unit Analysis Method Colorimetric Sample Size 5 mL Number of Tests 100 Case Dimensions 115x102x82 mm (4. 5x4. 0x3. 2") Shipping Weight 110 g (3. 9 oz. ) INSTRUCTIONS READ THE ENTIRE INSTRUCTIONS BEFORE USING THE KIT · Note: always shake the reagent bottle before use. [. . . ] Under neutral conditions water is dissociated into the OH- and H+ ions in equal ratio and hence it has a pH of 7. When bases or acids are added to a water solution they ionize, increasing the concentration of OH- or H+, respectively. Thus solutions with a pH of 1-3 contain strong acids, whereas those with a pH of 4-6 contain weak acids. Weak bases result in solutions of pH 8-10 and strong bases in pH of 11-13. Examples of pH value for some liquids: Liquid pH Value sea water 7. 8-8. 2 gastric juices 1. 7 milk 6. 5-7 soil 6-7 (optimum for crops) PRINTED IN ITALY HEALTH AND SAFETY The chemicals contained in this kit may be hazardous if improperly handled. Read Health and Safety Data Sheet before performing this test. · Replace the cap and mix the solution by inverting the cube several times. www. hannainst. com ISTR3880R2 Note: Any damaged or defective item must be returned in its original packing materials. 02/03-L Dear Customer, Thank you for choosing a Hanna Product. Please read the instructions carefully before using the chemical test kit. [. . . ] Each kit is supplied with: · HI 3880-0 pH 4. 0-6. 5 Reagent, 1 bottle with dropper (25 mL); · 1 color comparator cube. · Determine which color best matches the solution in the cube and record the result as pH unit. · It is better to match the color with a white sheet at about 10 cm behind the color comparator cube. CHEMICAL REACTION HI 3880-0 Hanna Reagent reacts in contact with the aqueous solution changing its color according to the hydrogenion concentration (pH) in the given range. [. . . ]