Potentiometric Standardization of HCl with TRIS with Mettler Toledo’s EasyPlus Titrator

The HCl 0.1 mol/L titer application available from METTLER TOLEDO helps standardize HCl titrant with Tris(hydroxymethyl)-aminomethane.

Monitoring of the titration is performed through potentiometric measurement using a pH sensor. The equivalence point (EQP) is obtained by assessing the titration curve at the inflection point.

Sample

Primary standard, Tris(hydroxymethyl) aminomethane (TRIS/THAM), with a weight of 0.05–0.1 g.

Procedures for Preparation

• 0.05–0.1 g of TRIS is weighed into the titration beaker
• 50 mL of deionized water is then added and the titration is started

Compound

Tris(hydroxymethyl) aminomethane (TRIS/THAM)

Chemicals

• Standard: Tris(hydroxymethyl) aminomethane (TRIS/THAM)
• Deionized water

Titrant

• Titrant—0.1 mol/L HCl
• Titer—Tris(hydroxymethyl) aminomethane (TRIS/THAM), with a weight of 0.05–0.1 g

Instruments

EasyPlus Titrator Easy pH

Indication

• pH Sensor, EG11-BNC

Method

• Titration type—direct
• Calculation—titer
• EQP /EP—EQP
• Sample ID—none
• Sample size entry—weight
• Control—normal
• Pre-stir duration—30 seconds
• Stir—medium
• Multiple determinant—yes
• Pre-dispense—0 mL
• Relevant EQP—1
• Report—long

Results

Titer HCL:

• R1: 1.003
• R2: 0.999
• R3: 0.999
• R4: 0.998
• R5: 1.001

Statistics:

• S_rel = 0.20% (n = 5)
• ± 0.0020

Image Credit: Mettler Toledo - Titration

Waste Disposal

Aqueous solution should be neutralized before it is disposed of.

Comments

• Users should ensure that the solution with the standard is adequately stirred before titration

Limits

Sample size limits (minimum to maximum) vary from 0.05 to 0.1 g.

Author

My Hoa Khau, MSG AnaChem, v1.0.

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This information has been sourced, reviewed and adapted from materials provided by Mettler Toledo - Titration.

For more information on this source, please visit Mettler Toledo - Titration.