Hanna Instruments HI 902 Color, Quick Start Manual

Page: 199 / 248

Method ID: HI0002EN
0.1N Hydrochloric Acid Titrant Concentration
Titrator Application Methods: General Methods - r. 2.3
Description:
Method for the standardization (titer determination)
of 0.1N Hydrochloric Acid (HCl) titrant solution
against standardized 0.1N Sodium Hydroxide
(NaOH) solution. The results are expressed in
N
(eq/L) .
Reference:
AOAC Official Methods of Analysis, Official Method
936.15
Electrode :

HI 1131B Combination pH Electrode

HI 7662-T Temperature Probe
Reagents :

HI 70463 0.1N Hydrochloric Acid solution (1 L)

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 : A pH electrode calibration is not needed for
this method.
Procedure :

Connect the pH electrode and temperature probe
to the titrator.

Press “
Select Method
” from the main screen. Use
the arrow keys to highlight „HI0002EN 0.1N HCl
Titr.
Conc.‟ and press “
Select
”.

Install a 25-mL burette filled with 0.1N
hydrochloric acid solution (HI 70463) 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.

Use a class-A volumetric pipette to transfer
exactly 10.00 mL of standardized 0.1N sodium
hydroxide solution (HI 70456) to a clean 100-mL
plastic beaker. Add distilled water to the 50-mL
mark on the beaker.
For the determination of the exact concentration of
sodium hydroxide, follow HI0001EN 0.1N Sodium
Hydroxide Titrant Concentration .

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 titrant concentration. The result is
expressed in
N (eq/L) of hydrochloric acid .

Remove the electrodes and stirrer from the
sample and rinse them thoroughly with distilled
water.

Record the result (titer concentration).
NOTE: For improved accuracy, repeat this
procedure a minimum of three times and calculate
the average value.
For methods utilizing 0.1N HCl titrant solution,
follow
the steps below to enter the
titer/standardized value.

Select the method utilizing 0.1N HCl.

Select „Method Options‟ from the main screen.

Using the arrow keys, highli
ght „Titrant Conc.‟ and
press “Select”.

Use the numeric keypad to enter the standardized
(titer) value of the titrant then press „Accept‟.

Press „Escape‟ to exit the Method Options screen
and select „Save Method‟ option.
Method Parameters :
Name: 0.1N HCl Titr. Conc.
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: 0.030 mL
max Vol: 0.500 mL
delta E: 6.000 mV
End Point Mode: pH 1EQ point, 1st Der.
Recognition Options:
Threshold: 500 mV/mL
Range: No
Filtered Derivatives: No
Pre-Titration Volume: 5.000 mL
Pre-Titration Stir Time: 0 sec
Measurement Mode: Signal Stability
delta E: 1.0 mV
delta t: 2.0 sec
t-min wait: 3 sec
t-max wait: 15 sec
Electrode Type: pH
Blank Option: No Blank
Calculations: Stdz. Titrant by Volume
Dilution Option: Disabled
Titrant Name: 0.1N HCl
Analyte Size: 10.000 mL
Analyte Entry: Fixed
Maximum Titrant Volume: 15.000 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
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