Maltose undergoes mutarotation at its hemiacetal anomeric center. Recall that the process occurs via an open-chain structure containing an aldehyde. The free aldehyde formed by ring opening can react with Fehling’s solution, so maltose is a reducing sugar. What does Benedict’s test react with? Benedict’s test: A chemical reaction usedRead More →
A range of high purity reagents suitable for a variety of analytical techniques. These bulk packs offer extensive guaranteed specifications, with potential contaminents meaured on every batch of material to ensure a consistent performance time after time. What is good analytical reagent? An analytical reagent is considered good if itRead More →
Principle of Molisch’s test: H2SO4 get dehydrated to form furfural and its derivatives. When monosaccharide are treated with conc H2SO4 or conc HCl, -OH group of sugar are removed in the form of water and furfural is formed from pentose sugar and hydroxymethyl furfural is formed from hexose sugar. HowRead More →
Salkowski reagent is a mixture of 0.5 M ferric chloride (FeCl3 ) and 35% perchloric acid (HClO4) which upon reaction with IAA yields pink color, due to IAA complex formation with and reduction of Fe3+ ( Kamnev et al., 2001 ). Which acid is used in salkowski test? Treating aRead More →
A widely used presumptive test that gives a variety of colour changes with a range of compounds. It is particularly useful for detecting opiate alkaloids and for amphetamines and methamphetamine. Marquis reagent is a mixture of methanal (formaldehyde) solution in water with sulphuric acid. What is Van Urk test? ARead More →
A biuret reagent may be used to test the aqueous sample. This blue reagent is made by combining sodium hydroxide and copper sulfate solutions. A few drops of this reagent will turn the aqueous sample containing compounds with peptide bonds from pale to intense violet colour. What are the twoRead More →
A ketone does not react with Benedict’s reagent and Tollens’ reagent. Do ketones give Benedict’s test? Tollen’s Test: Aldehydes give positive Tollen’s test (silver mirror) while ketones do not give any reaction. … Benedict’s Test: Aliphatic aldehydes on treatment with Benedict’s solution give a colored precipitate while aromatic aldehydes andRead More →
Benzaldehyde gives silver mirror with Tollen’s reagent. Which aldehyde does not give tollen’s test? Tollens’ reagent gives a negative test for most ketones, with alpha-hydroxy ketones being one exception. The test rests on the premise that aldehydes are more readily oxidized compared with ketones; this is due to the carbonyl-containingRead More →
When treatment of formaldehyde with conc. NaOH solution, methanol and sodium formate are formed. What is the formula of formaldehyde? Formaldehyde is a colorless gas synthesized by the oxidation of methanol. The chemical formula for the highly toxic organic chemical compound is CH2O. Its CAS number is 50-00-0. In solution,Read More →
The ceric ammonium nitrate test is a way to examine a solution for the presence of either alcohols or phenols. In solution, the orange-yellow ceric ammonium nitrate makes a complex with the alcohol or phenol, which results in a color change. Do phenols give Ceric Ammonium Test? CAN Test: PhenolsRead More →