Glossary - Hanna Instruments Hi934 Bedienungsanleitung

6. GLOSSARY

Acid
A chemical species that can donate one or more protons (hydrogen ions).
Acid-Base Titration
Stoichiometric neutralization titrations, based upon the reaction that occurs between an acid and base.
Activity
A physical property corresponding to the concentration of all ions in a solution. Electrodes respond to activity.
Amperometric Titration
Titrations where the current flow between two electrodes (often a metal electrode and a reference electrode) are used to
monitor the titration progress.
Analyte
The chemical species being measured in a titration.
Argentometric Titration
Titrations that use silver (nitrate) as the titrant. These titrations are typically precipitation titrations.
Automatic Titrator
An instrument designed to automatically carry out a titration. It will add the appropriate amount of titrant, determine
the endpoint and calculate the results.
Back Titration
A type of titration where an excess amount of titrant is added to a sample forcing a sluggish reaction to go to completion.
The excess reagent is then "back" titrated with a second titrant.
Base
A chemical species that can accept one or more protons (hydrogen ions).
Biamperometric Indication
Uses a double platinum pin electrode to measure the current flow through a titration solution.
Bivoltametric Indication
Uses a double platinum pin electrode to measure the voltage required to maintain a constant current flow through a
titration solution while constant voltage is applied across the platinum elements of the electrode.
Burette
A graduated cylindrical piece of laboratory glassware that is used to dispense precise amounts of solution.
Complex Ion
A species where a central metal ion is covalently bonded to one or more electron donating groups called ligands.
Complexometric Titrations
Metal ions are titrated using a titrant that binds strongly to it. The titrants often contain Ethylenediaminetetraacetic Acid
(EDTA) or Cyclohexylenedinitrilotetraacetic Acid (CDTA).
End point
The point where a titration is stopped because a physical change in the solution has indicated a completed titration.
Titration endpoints typically coincide with the equivalence point. A fixed value endpoint (pH or mV) can be used as well,
the titration will stop at the desired point regardless of whether or not is complete.
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