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Fajans' Rules, formulated by Kazimierz Fajans in 1923, are used to predict whether a chemical bond will be covalentor ionic, and depend on the charge on the cation and the relative sizes of the cation and anion.
IonicCovalentLow positive chargeHigh positive chargeLarge cationSmall cationSmall anionLarge anion
Thus sodium chloride (with a low positive charge (+1), a fairly large cation (~1 Å) and relatively small anion (2Å) is ionic; but aluminum iodide (AlI3) (with a high positive charge (+3) and a large anion) is covalent.
What else can I help you with?
where was the element protactinium found?
Protactinium was first discovered in 1913 in Germany by Kasimir Fajans and Oswald Helmuth Göhring. It was later independently discovered in 1917 in the United States by John Arnold Cranston and Frederick Soddy.
Why must the titrations in fajans method be carried quick and iniffuse ligt?
In Fajans method, quick titration is necessary to minimize the effect of background diffusion that could affect the accuracy of the endpoint determination. Using diffuse light helps to prevent any color changes from being obscured, making it easier to visually detect the endpoint in the titration process.
What are the conditions of Fajans method in Precipitation Titration?
Fajans' method makes use of two facts regarding adorption effects on precipitates of a colloidal or semicolloidal state 1. finely divided precipitates tend to adsorb o their surface ions present in the solution. by doing so, the particles become electrically charged. 2. a preciptate tend to adsorb ions common to itself. thus, a precipitate of AgCl tend to adsorb Ag/Cl- in preference to forgeign ions like NO3 and Na. Futhermore, the adsorption indicator used should not be too weakly or too strongly adsorbed by the precipitate. Otherwise, false endpoints could be observed.
What are precipitation titrations?
Precipitation titrations involve the formation of a precipitate by adding a titrant to a solution containing the analyte. The equivalence point is reached when the precipitate just starts to form. Common examples include Mohr's method for chloride determination and Fajans method for determining halides.
Do LiCl contain covalent bonds?
No, lithium chloride (LiCl) does not contain covalent bonds. LiCl is an ionic compound formed by the transfer of electrons from lithium to chlorine, resulting in the formation of ionic bonds between the two atoms.
When was Maksymilian Fajans born?
Maksymilian Fajans was born in 1827.
When did Maksymilian Fajans die?
Maksymilian Fajans died in 1890.
When did Kazimierz Fajans die?
Kazimierz Fajans died on 1975-05-18.
When was Kazimierz Fajans born?
Kazimierz Fajans was born on 1887-05-27.
What has the author K Fajans written?
K. Fajans has written: 'A textbook of practical physical chemistry'
What has the author Michael Fajans written?
Michael Fajans has written: 'An alternative to the automobile' -- subject(s): Berkeley University of California, Choice of transportation, Students, Transportation
Can we Use fajans method to determined the exact concentation of a approximate 0.01 M hcl solution?
No, Fajans method is not suitable for accurately determining the concentration of a dilute 0.01 M HCl solution. Fajans method is typically used for determining the concentration of anions in a solution, specifically for halide ions in the presence of a specially selected indicator. For accurate determination of the concentration of a 0.01 M HCl solution, titration with a suitable base such as sodium hydroxide would be more appropriate.
Who discovered protactinium and what date did they discovered it?
Protactinium was discovered in 1913 by Fajans and Gohring in Karlsruhe, Germany.
where was the element protactinium found?
Protactinium was first discovered in 1913 in Germany by Kasimir Fajans and Oswald Helmuth Göhring. It was later independently discovered in 1917 in the United States by John Arnold Cranston and Frederick Soddy.
Why must the titrations in fajans method be carried quick and iniffuse ligt?
In Fajans method, quick titration is necessary to minimize the effect of background diffusion that could affect the accuracy of the endpoint determination. Using diffuse light helps to prevent any color changes from being obscured, making it easier to visually detect the endpoint in the titration process.
When was Protactinium discovered?
The first isotope of protactinium (234mPa) was discovered by Kasimir Fajans and Otto Gohring in 1913. The isotope 231Pa of protactinium was discovered by Austrian/Swedish physicist Lise Meitner and by Otto Hahn, a German physical chemist in 1918 and simultaneously by Frederick Soddy and John Cranston. Who named it? The International Union of Pure and Applied Chemistry (IUPAC) often discusses the appropriate name for an element.
What are the conditions of Fajans method in Precipitation Titration?
Fajans' method makes use of two facts regarding adorption effects on precipitates of a colloidal or semicolloidal state 1. finely divided precipitates tend to adsorb o their surface ions present in the solution. by doing so, the particles become electrically charged. 2. a preciptate tend to adsorb ions common to itself. thus, a precipitate of AgCl tend to adsorb Ag/Cl- in preference to forgeign ions like NO3 and Na. Futhermore, the adsorption indicator used should not be too weakly or too strongly adsorbed by the precipitate. Otherwise, false endpoints could be observed.
