What is masking and Demasking agents in titration?
What is masking and Demasking agents in titration?
Masking may be defined as the process in which a substance, withoutphysical separation of it or its reaction products, is so transformed that it does not enter into a particular reaction. Demasking is the process inwhich the masked substance regains its ability to enter into a particular reaction.
What is masking agent with example?
A masking agent is a reagent used in chemical analysis which reacts with chemical species that may interfere in the analysis. In sports a masking agent is used to hide or prevent detection of a banned substance or illegal drug like anabolic steroids or stimulants.
What is complexometric titration PPT?
•Complexometric titrationComplexometric titration is a type ofis a type of titration based on complex formation between the analyte and titrant. • Complexometric titrations are particularly. Titrations, Complexometric titrations, Complexometric.
Which is the masking agent for complexometric titration with EDTA?
Masking agents
| Masking agent | pH | Ions titrated with EDTA |
|---|---|---|
| Cyanide | 10 | Pb, Mn, Mg, Ca, alkaline earths, rare earths |
| Triethanolamine | 10 | Zn, Cd, Pb, Mn, rare earths |
| Aluminium Fluoride | 10 6 | Zn, Cd, Mn Cu |
| Ascorbic acid | 2 | Bi, Th |
What is the difference between masking and Demasking agent?
A masking agent is a reagent which is basically used in the chemical analysis that reacts with some chemical species that might interfere in the ongoing analysis whereas demasking is the process where the masked substance regains its ability of entering into a particular reaction which is going on.
What are complexing agent?
Complexing agents are chemicals that are able to form complexes with one of the ions involved in the precipitation, thus reducing the activity of the ion and enhancing the stability of the solution.
Which is used as masking agent?
Interference by iron, copper, aluminium and zinc is suppressed by including triethanolamine, thiourea, fluoride, acetylacetone or cyanide in the buffer as masking agents. Species such as iron or copper can completely prevent the pre-concentration of lead.
What is the purpose of a masking agent?
A masking agent is a substance used in order to try to conceal the presence of prohibited drugs in his or her system.
What is the principle of complexometric titration?
Complexometric titration (sometimes chelatometry) is a form of volumetric analysis in which the formation of a colored complex is used to indicate the end point of a titration. An indicator capable of producing an unambiguous color change is usually used to detect the end-point of the titration.
What is the application of complexometric titration?
Applications of Complexometric Titrations Complexometric titration is used for estimation of amount of total hardness in water. It is widely used in pharmaceutical industry to determine metal concentration in drugs. Titanium dioxide is used in many cosmetic products. This can be analysed by complexometric titration.
Which masking agent is used for mercury?
thiourea
A method is described for selective complexometric determination of mercury, thiourea being used as masking agent. An excess of EDTA is added and the surplus EDTA is back-titrated with lead nitrate, with Xylenol Orange or Methylthymol Blue as indicator (pH 5-6).