Phosphomolybdic acid, preparation

Phosphomolybdic acid oxidizes most organic compoimds nnder formation of a bine-grey dye. For reagent preparation, 250 mg of phosphomolybdic acid must be dissolved in 50 ml of methanol. The plate mnst be heated to 120°C until the predominantly blue spots are visible [17]. 

Molybdo-ar senates.—The free acid corresponding to ordinary phosphomolybdic acid has not been prepared, but the two acid salts, R3H4[As(Mo207)e].4H20, where R =NH4 or K, have been obtained in the form of deep yellow crystalline precipitates by adding arsenic add in small quantities to solutions of the molybdates previously made acid... 

General Reactions of Alkaloids (Section 670).—Dissolve the amount of quinine sulphate that can be held on the point of a pen-knife in about 20 cc. of water. Observe the appearance of the solution. Add to 2 cc. of the solution drop by drop, a dilute (1 per cent) solution of tannic acid. Repeat using solutions of phosphomolybdic acid, picric acid, iodine in potassium iodide, and potassium mercuric iodide. The last-named solution can be prepared by adding an excess of a solution of potassium iodide to a solution of mercuric chloride. 

A calibration curve for the colorimetric determination of phosphorous in urine is prepared by reacting standard solutions of phosphate with molybdenum(VI) and reducing the phosphomolybdic acid complex to produce the characteristic blue color. The measured absorbance A is plotted against the concentration of phosphorous. From the following data, determine the linear least-squares line and calculate the phosphorous concentration in the urine sample ... 

This work reports the preparation of new supports for Mo- and NiMo-hydrotreating catalysts. Zr-containing mesoporous silicas with Zr/Si ratio from 0 up to 0.04 were prepared using TEOS, Zr0C102 and dodecylamine as a template. The materials and those modified with 12 % wt. Mo from 12-phosphomolybdic acid (HPMo) and its nickel salt were characterised by IR, TPD of NH3, TPR and their activities were measured in thiophene HDS. Activities in HDS of thiophene of Mo-containing catalysts prepared with the mesoporous silicas were higher than those of the catalysts prepared with amorphous silica. 

Composite membranes prepared by casting Nafion 15 on films made from PPE and phosphomolybdic acid show a lower methanol permeability in comparison to pure Nafion 15. The composite membranes have a potential application as electrol5d es in direct methanol fuel cells. 

Thin-layer separations may be analytical or preparative (up to 100 mg per 20 x 20 cm plate depending on the ease of separation). Separated lipids can be made visual with a destructive spray (for analytical purposes only) such as phosphomolybdic acid solution or with a non-destructive spray such as 2, 7 -dichlorofluorescein solution (essential for preparative purposes). Improved separations are sometimes achieved through multiple development or by operating at subambient temperature. 

For some examples of the direct three-component preparation of homoallylic amines, see (a) G. Smitha, B. Miriyala, J. S. Williamson, Synlett 2005, 839-841. Phosphomolybdic acid-catalyzed efficient three-component reaction a facile synthesis of protected homoallylic amines, (b) P. Phukan,... 

Prepare enough 5% phosphomolybdic acid in ethanol to fill a dipping or... 

The electrode designed for detection of dextromethorphan (DMX) hydrobromide contains in the polymer membrane phase associative DXM salt with reineckate salt or phosphomolybdic acid dissolved in dioctylphthalate or dibutylsebacate [63]. The electrode can be used for determination of the active ingredient in pharmaceutical preparations in the range of dextromethorphan concentration of 5 x 10 -5xl0 mol L with pH 2.5-6.5. The lowest concentration of this compoimd that can be determined is 1.0 X 10 mol L b The statistical data from the measiu-ement in clean samples and pharmaceutical preparations show very good statistical parameters average yield of 99.8% and standard deviation (RSD) of 0.4%. 

Reagents 1) Silver arsenate prepared by the action of sodium arsenate on silver nitrate. The precipitate may be isolated by centrifuging. The product is washed thoroughly and then dried at 110 C 2) 3% solution of phosphomolybdic acid in 1 1 hydrochloric acid... 

A method for the estimation of glucose in body fluids. In the technique a protein-free filtrate of the sample is prepared using tungstic acid. Glucose in the filtrate reduces cupric ion to cuprous ion. The cuprous ion then reduces phosphomolybdic acid to molybdenum blue which can be estimated color-imetrically. 

Detection system. Phosphomolybdic acid (3.0g) was dissolved in a 100 cm volumetric fiask with ethanol and diluted to volume with water. Filter if necessary to remove any solids prior to use. The solution must be prepared fresh every two days. 

Sommelet process org chem The preparation of thiophene aldehydes by treatment of thiophene with hexamethylenetetramine.. so-mol ya, pra-sos Sonnenschein s reagent analychem A solution of phosphomolybdic acid that forms a yellow precipitate with alkaloid sulfates. z6n-on,shTnz re,a-jont sonocatalysis chem 1. Initiation of a catalytic reaction by irradiation with sound or ultrasound. 2. Use of sound to Impart catalytic activity to a chemical compound san-o-ko tal-o sos)... 

Ratnani et al. [94] prepared three types of organicfinorganic composite membranes with different HPA additives such as phosphotungstic acid, sUicotungstic acid, phosphomolybdic acid, and silicomolybdic acid. 

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