sodium tungstate

Sodium tungstate and lead have been studied for their effect on earthworms.

Several polymorphs of sodium tungstate are known, three at only one atmosphere pressure.

It may also be prepared from the reaction between hydrogen carbonate and sodium tungstate.

Treatment of sodium tungstate with hydrochloric acid gives the trioxide:

The Folin-Wu method uses a reagent that contains sodium tungstate.

Sodium tungstate is a competitive inhibitor of molybdenum.

Thus, the ores, are treated with base to give sodium tungstate, as illustrated in the case of wolframite:

Sodium tungstate is the inorganic compound with the formula NaWO-2HO.

Wöhler's 1823 synthesis involved reducing sodium tungstate and tungsten trioxide with hydrogen gas at red heat.

In 1841, a chemist named Robert Oxland gave the first procedures for preparing tungsten trioxide and sodium tungstate.

It is also known for its anti-diabetic effects; Researchers have identified the pathways through which sodium tungstate improves pancreatic function and beta cell proliferation.

Lead was found to be lethal at low levels and sodium tungstate was much less toxic, but the tungstate completely inhibited their reproductive ability.

In organic chemistry, sodium tungstate is used as catalyst for epoxidation of alkenes and oxidation of alcohols into aldehydes or ketones.

This should not be confused with Folin-Ciocalteu reagent, which is a mixture of sodium tungstate and sodium molybdate that is used to detect phenolic compounds.

It is prepared by oxidation of (CH)CNH using hydrogen peroxide in the presence of sodium tungstate as a catalyst.

Sodium tungstate is used in Folin-Ciocalteu's reagent, a mixture of different chemicals used in the "Lowry Assay" for protein content analysis.

Sodium tungstate can also be produced by treating tungsten carbide with a mixture of sodium nitrate and sodium hydroxide in a fusion process which overcomes the high exothermicity of the reaction involved.

Phosphotungstic acid can be prepared by the reaction of sodium tungstate, NaWO.2HO, with phosphoric acid, HPO, acidified with hydrochloric acid, HCl.

The sample is crushed and desirable material, such as a particular mineral (quartz in the case of Be-10), is separated from non-desirable material by using a density separation in a heavy liquid medium such as lithium sodium tungstate (LST).