Hanna Instruments HI 902 Color, Quick Start Manual

Page: 215 / 248

Method ID: HI1009EN
Neutralization with Sodium Hydroxide
0.00-200.00 meq/L
Titrator Application Methods: General Methods - r. 2.3
Description:
Method for the determination of concentration of
strong or weak acids, by titration of a sample to the
first equivalence point. The results are expressed in
meq/L .
Electrode :

HI 1131B Combination pH Electrode

HI 7662-T Temperature Probe
Reagents :

HI 70456 0.1N Sodium Hydroxide solution (1 L)

HI 70436 Distilled Water (1 gal)
Accessories :

HI 70300L Storage Solution (500 mL)

HI 7071 Electrode Fill Solution (4*30 mL)

HI 7004L pH 4.01 Buffer Solution (500 mL)

HI 7007L pH 7.01 Buffer Solution (500 mL)

HI 7010L pH 10.01 Buffer Solution (500 mL)

HI 740036P 100 mL Plastic Beakers (10 pcs)

10-mL Class-A Volumetric Pipette
NOTE : For this method a pH electrode calibration is
not necessary.
Procedure :

Connect the pH electrode and temperature probe
to the titrator.

Press “
Select Method
” from the main screen. Use
the arrow keys to highlight „HI1009EN
Neutralization w/ NaOH‟ and press “
Select
”.

Install a 25-mL burette with 0.1N sodium
hydroxide solution (HI 70456) on pump-one and
verify that no air bubbles are present in the burette
or tubing. If necessary prime until all air has been
removed completely.
For the determination of the exact concentration of
sodium hydroxide, follow
HI0001EN 0.1N Sodium
Hydroxide Titrant Determination .

Use a class-A volumetric pipette to transfer
exactly 10.00 mL of sample to a clean 100-mL
plastic beaker, and use distilled water to bring up
the volume to about 50 mL.

Place the beaker under the stirrer assembly and
immerse the pH electrode, temperature probe and
stirrer. Ensure that the reference junction of the
pH probe is 5-6 mm below the surface. If
necessary add extra distilled water.

Press “
Start
”. The titrator will start the analysis.

At the end of the titration, after detection of the
equivalence point, „titration completed‟ will appear
with the acid concentration. The result is
expressed in
meq/L .

Remove the electrodes and stirrer from the
sample and rinse them thoroughly with distilled
water.

Record the result.
Method Parameters :
Name: Neutralization w/ NaOH
Method Revision: 2.3
Titration Type: Standard Titration
Analog Board: Analog 1
Stirrer Configuration: Stirrer 1
Pump Configuration:
Titrant Pump: Pump 1
Dosing Type: Dynamic
min Vol: 0.050 mL
max Vol: 0.500 mL
delta E: 20.000 mV
End Point Mode: pH 1EQ point, 1st Der.
Recognition Options:
Threshold: 50 mV/mL
Range: No
Filtered Derivatives: No
Pre-Titration Volume: 0.000 mL
Pre-Titration Stir Time: 0 sec
Measurement Mode: Signal Stability
delta E: 1.0 mV
delta t: 2.0 sec
t-min wait: 2 sec
t-max wait: 15 sec
Electrode Type: pH
Blank Option: No Blank
Calculations: Sample Calc. by Volume
Dilution Option: Disabled
Titrant Name: 0.1N NaOH
Titrant Conc.: 0.1000 N(eq/L)
Analyte Size: 10.000 mL
Analyte Entry: Fixed
Maximum Titrant Volume: 20.000 mL
Stirring Speed: 1400 rpm
Potential Range: -2000.0 to 2000.0 mV
Volume/Flow Rate: 25 mL/50 mL/min
Signal Averaging: 1 Reading
Significant Figures: XXXXX
Calculations :
Calculations: Sample Calc. by Volume
Titrant units: N (eq/L)
Titrant volume dosed: V (L)
Final result units: meq/L
Titrant conc.: 0.1000 mol/L
(sample/titrant): 1.000 eq/mol
Sample volume: 10.000 mL
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