Hanna Instruments HI 3881O User Manual
Instruction Manual
HI 3881/O
pH 6.0-8.5
Test Kit
www.hannainst.com
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 a 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:
HI 3881-0 pH 6.0-8.5 Reagent, 1 bottle with
•
dropper (25 mL);
Dechlorinating Reagent, 1 bottle with dropper (10
•
mL), to be used in presence of chlorine above 50
ppm;
1 color comparator cube.
•
Note: Any damaged or defective item must be returned in
its original packing materials.
SPECIFICATIONS
Range 6.0 to 8.5 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 150 g (5.3 oz.)
SIGNIFICANCE AND USE
pH represents acidity or alkalinity of an aqueous solution
and is proportional to the hydrogen-ion concentration of the
solution. 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)
CHEMICAL REACTION
HI 3881-0 Hanna Reagent reacts in contact with the
aqueous solution changing its color according to the hydrogen-ion concentration (pH) in the given range.
ISTR3881/OR2 09/02 PRINTED IN ITALY
INSTRUCTIONS
READ THE ENTIRE INSTRUCTIONS BEFORE USING THE KIT
• Note: always shake the HI 3881-0 reagent bottle
before use.
• Fill the color comparator cube with 5 mL of
the sample.
• In case of concentration of chlorine above 50 ppm, add
one drop of Dechlorinating Reagent to the sample.
Replace the cap and mix by inverting the cube several
times.
• Add 5 drops of reagent HI 3881-0.
• Replace the cap and mix the
solution by inverting the
cube several times.
• 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.
Note: To measure pH in the 4.0-6.5 range use the HI
3880 pH 4.0-6.5 Test Kit.
To measure pH in the 7.5-10.0 range use the HI
3886 pH 7.5-10.0 Test Kit.
REFERENCES
Vogel's
Quantitative Chemical Analysis
5th Ed.
Longman Scientific & Technical.
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.
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