What is Karl Fischer moisture titrator?

The Karl Fischer Method Karl Fischer Titration is a technique for the determination of moisture content. The technique was developed by a chemist named Karl Fischer. It is based on a reagent which reacts with water and converts the water into a non-conductive chemical.

How do you calculate water content by Karl Fischer?

The water equivalence factor F is determined according to the formula 0.1566 x w / v in mgs of H2O per ml of reagent, where W is the sodium tartrate weight in mgs, and V is the reagent volume in ml.

What is the composition of Karl Fischer reagent?

Karl Fischer reagent consists of iodine, sulfur dioxide, a base and a solvent, such as alcohol.

What is coulometric analysis?

Coulometric analysis is an electrochemical method, in which an analyte of interest is exhaustively electrolysis adjacent to the surface of electrode [1].

What is coulometric titration used for?

Coulometric titration is an absolute determination technique in which the mass of a given substance is determined by measuring the quantity of electricity required to electrolyze that substance; it does not necessarily require a standard solution.

What is the limit of KF factor?

Standardization is valid, if concentration should be not less than 5 mg and not more than 7mg. The relative Standard deviation between two average KF factors of water and DST determined consecutively should not be more than 3.0 % [Average of two factors (2 with water and 2 with DST) to be considered for calculation.]

Why DST is used for KF calibration?

Answer. Sodium tartrate dihydrate is the volumetric standard for Karl Fischer titration. Under normal conditions, it is stable and non-hygroscopic. Sodium tartrate dihydrate has a stoichiometric water content of 15.66% and is primarily used for titer determination in volumetry.

How do you calculate water content?

Calculation

  1. Calculate the mass of moisture = W2 – W3.
  2. Calculate the mass of dry soil = W3 – W1.
  3. Calculate the water content w(%) = (W2 – W3) / (W3 – W1) * 100.

What is coulometric titration?

What is current efficiency of coulometric experiment?

In controlled-potential coulometry, accuracy is determined by current efficiency and by the determination of charge. If the sample is free of interferents that are easier to oxidize or reduce than the analyte, a current efficiency of greater than 99.9% is routine.

What is the use of coulometry?

Coulometry determines the amount of matter transformed during an electrolysis reaction by measuring the amount of electricity (in coulombs) consumed or produced. It can be used for precision measurements of charge, and the amperes even used to have a coulometric definition.