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Fehling's solution is prepared just before use by mixing equal volumes of two previously prepared solutions, one containing about 70 grams cupric sulfate pentahydrate per liter of solution
and the other containing about 350 grams Rochelle salt (potassium sodium tartrate tetrahydrate) and 100 grams sodium hydroxide per liter of solution. The cupric ion (complexed with tartrate ion) is reduced to cuprous ion by the aldehyde (which is oxidized) and precipitates as cuprous oxide (Cu2O).
So the tartrate part of Rochelle salt is the key reactant.
In the case of sodium citrate: the cupric ion (complexed with citrate ions) is reduced to cuprous ion by the aldehyde group (which is oxidized), and precipitates as cuprous oxide, Cu2O.
Thus the citrate is key to the reaction.
What else can I help you with?
Is 2AgNO3 a solid gas or acid?
2AgNO3 is a solid compound. It is silver nitrate, a salt that is commonly used in laboratory settings as a reagent.
Is disodium salt considered as a primary standard?
No, disodium salt is not typically considered a primary standard in analytical chemistry. Primary standards are highly pure compounds that can be used to accurately determine the concentration of a known substance in a solution. Disodium salt is more commonly used as a secondary standard or as a reagent in laboratory experiments.
How can you identify Ammonium?
Ti identify ammonium ion, NaOH is added to the original solution of the ammonium salt and a paper dipped in HCl is brought to mouth of test tube. If white vapours are observed, then ammonium is present. Or Neissler's reagent(K2HgI4) can be added to the original solution of the ammonium salt. A reddish brown ppt. is observed in case of ammonium ion.
What salt is formed when potassium hydroxide reacts with suphuric acid?
The salt formed by potassium hydroxide and sulphuric acid is potassium sulphate (K2SO4). Though if potassium hydroxide is the limiting reagent potassium bisulphate (KHSO4) will also form.
What is the mechanism of the reaction between mayer's reagent and an alkaloid?
[HgI4]-(aq) reacts with the lone pairs of nitrogen that are present, then the typical off-white precipitate falls out. A uncharged mercury salt is thus obtained. In some alkaloids there isn't a reaction with Mayer's reagent because it lacks lone pairs (example berberine) and it reacts also with alkaline peptides. This mechanism is actually similar then Dragendorff's reagent.
What reagent is used to test for NaCl?
To determine the concentration of salt a salinometer can be used.
What are the different kinds of salts?
acidic salt basic salt normal salt
What type of crystal exhibit piezoelectricity?
Examples: tourmaline, quartz, Rochelle salt, topaz etc.
Where use base?
1)they are use to form laboratory salt when combined with acid. 2)they are used to detect the chemical reagent. 3)they are use to manufacture many laboratory reagent.
Is 2AgNO3 a solid gas or acid?
2AgNO3 is a solid compound. It is silver nitrate, a salt that is commonly used in laboratory settings as a reagent.
What is the functional role of salt?
Salt^pepper
What is the purpose of the NaNO2 when preparing the Pauly reagent?
In the presence of sodium nitrite and hydrochloric acid, sulfanilc acid form a diazonium salt. This salt react with and is an indicator for thyrosine, histidine.
What is a bicinchoninate?
A bicinchoninate is any salt or ester of the quinoline carboxylic acid 2,2'-biquinoline-4,4-dicarboxylic acid; - the sodium salt of which is a colourimetric reagent used to detect proteins.
WHAT ISPasteur's salt solution?
Laboratory reagent consisting of potassium phosphate and calcium phosphate, magnesium sulfate, and ammonium tartrate in distilled water
What is the role of ice bath in preparation of double salt?
The coldness of the ice precipitates the salt out of the solution.
What is the role of the salt in tie-dying?
to make it fade
Is disodium salt considered as a primary standard?
No, disodium salt is not typically considered a primary standard in analytical chemistry. Primary standards are highly pure compounds that can be used to accurately determine the concentration of a known substance in a solution. Disodium salt is more commonly used as a secondary standard or as a reagent in laboratory experiments.
