Magnesium chloride solution

In preparation of MgCl2 from seawater, magnesium hydroxide, Mg(OH)2, is first precipitated from seawater by the addition of dolime or lime. This is then treated with hydrochloric acid to produce a neutralized magnesium chloride solution. The solution obtained is evaporated and converted into soHd magnesium chloride hexahydrate (60,61). 

Figure 9.6 Threshold stresses of two types of stainless steel in boiling 42% magnesium chloride solution. Reprinted with permission of American Society for Metals from Metals Handbook, vol. 10, 8th ed., Metals Park, Ohio, 1974, p. 210.)...

The occurrence of stress-corrosion cracking in the martensitic steels is very sensitive to the magnitude of the applied stress. For instance, a 13% chromium martensitic steel tested in boiling 35% magnesium chloride solution (125.5°C) indicated times to failure that decreased abruptly from more than 25(X)h to less than 0.1 h as the applied stress was increased from 620 MPa to about 650 MPa (Fig. 8.25). However, the effects of stress on time to failure are not always so dramatic. For instance, in the same set of experiments times to failure for a 17Cr-2Ni martensitic steel gradually decreased from more than 800 h to about 8 h as the applied stress was increased from 500 MPa to 800 MPa. 

Fig. 8.30 Effect of nickel content on the susceptibility to stress-corrosion cracking of stainless steel wires containing 18-20% chromium in a magnesium chloride solution boiling at 154°C...

Fig. 8.32 Effect of prestrain on the time to failure of type 310 stainless steel exposed to a magnesium chloride solution boiling at 154°C and stressed at 90% of the yield stress (after...

Magnesium chloride solution (0.01 Mj. Dissolve 0.608 g pure magnesium turnings in dilute hydrochloric acid, nearly neutralise with sodium hydroxide solution (1M) and make up to 250 mL in a graduated flask with de-ionised water. Pipette 25 mL of the resulting 0.1M solution into a 250 mL graduated flask and make up to the mark with de-ionised water. 

Buffer solution. Add 55 mL of concentrated hydrochloric acid to 400 mL de-ionised water and mix thoroughly. Slowly pour 310 mL of redistilled monoethanolamine with stirring into the mixture and cool to room temperature (Note 2). Titrate 50.0 mL of the standard magnesium chloride solution with standard (0.01M) EDTA solution using 1 mL of the monoethanolamine-hydrochloric acid solution as the buffer and solochrome black as the indicator. Add 50.0 mL of the magnesium chloride solution to the volume of EDTA solution required to complex the magnesium exactly (as determined in the last titration), pour the mixture into the monoethanolamine-hydrochloric acid solution, and mix well. Dilute to 1 litre (Note 3). 

The sulphate is precipitated as barium sulphate from acid solution, the precipitate is filtered off and dissolved in a measured excess of standard EDTA solution in the presence of aqueous ammonia. The excess of EDTA is then titrated with standard magnesium chloride solution using solochrome black as indicator. 

Procedure. Prepare a standard magnesium chloride solution (0.05M) and a buffer solution (pH 10) see Section 10.72. Standard EDTA (0.05M) will also be required. 

Quentin A process for regenerating the ion exchange resin used in sugar refining, using magnesium chloride solution. 

Fig. 1. Enthalpies of solution of lanthanide trihalides in aqueous media ( ) anhydrous trichlorides (183) and trichloride hexahydrates (189) in water (A) trichloride hex-ahydrates in dilute hydrochloric acid (190) ( ) trichloride hexahydrates in aqueous magnesium chloride solution (191) ( ) anhydrous triiodides in water (192). Values for the trichlorides refer to 25°C, for the triiodides to 20°C. Filled symbols represent experimental determinations, open symbols represent estimates.

Enthalpies of Solution for Lanthanide Trichloride Hexahydrates in Aqueous Magnesium Chloride Solutions at 25°C ... 

Figure 4. Osmotic coefficient for magnesium chloride solution at various temperatures (35)...

Pour 3 ml of a 1 W alkali solution into each of two test tubes. Add about 1 g of solid ammonium chloride to one of them and dissolve it by shaking the tube. Pour 2 ml of a magnesium chloride solution into both tubes. Why does no precipitate form in one case Explain the observed phenomenon proceeding from the change in the hydroxyl ion concentration. 

Pour 3-4 ml of a magnesium chloride solution into a test tube and add an ammonia solution. What happens Add a saturated ammonium chloride solution dropwise until the precipitate dissolves. How can the dissolution of the precipitate be explained Introduce into the test tube 1 ml of a sodium phosphate solution. What do you observe Examine the shape of the crystals under a microscope. What is the composition of the crystals Explain the processes that occur. Write the equations of the reactions. Pour hydrochloric acid into the test tube with the crystals. Explain the dissolving of the precipitate. 

A solution of normal sodium arsenate in aqueous ammonia and methyl or ethyl alcohol yields with lithium salts a pale pink precipitate which is quantitative and may be dried, ignited and weighed. An arsenite does not precipitate lithium. A mixture of the two acids may thus be quantitatively separated, the arsenate first by lithium in the presence of aqueous ammonia and alcohol, and the arsenite in the filtrate by precipitation with magnesium chloride solution.7... 

III by heating hydrated magnesium chloride crystals, and i2) by mixing magnesium chloride solution and magnesium oxide. Uses Source... 

It was very difficult to obtain the new compound of P d or P d as a solid salt, because a very small amount of P d or P d was present in very dilute aqueous solution. However, the preparation of a small volume of P d solution of relatively high concentration was successfully achieved by the following procedure the enrichment of phosphorus oxoacid species into a certain amount of an anion-exchange resin and the subsequent elution with a calculated volume of potassium chloride solution of a proper concentration. By adding small volumes of magnesium chloride solution and methyl alcohol to the resulting P d solution, 4 mg of magnesium salt of Pgd was obtained. 

To some magnesium chloride solution, add (a) some ammonium hydroxide (6) some ammonium chloride and then some ammonium hydroxide. In (a) a copious white precipitate is observed in (6) no precipitate. 

Dehydration of aqueous magnesium chloride solutions or hydrous car-nallite (MgCl2 KC1 6H2Q)... 

Magnesium Chloride Solution Add 100 mL of 10 N hydrochloric acid to 950 g of magnesium chloride (MgCl2-6H20), dissolve in and dilute to 1000 mL with water, and mix. Carefully add 400 mL of anhydrous methanol to 100 mL of the stock solution, and allow the mixture to come to room temperature before using. 

Procedure Place 150 mL of anhydrous methanol into each of two 500-mL glass-stoppered, conical flasks, the second of which is used as the reagent blank. Pressure-pipet 25.0 mL of the Magnesium Chloride Solution into each flask, allowing the same drainage time for each transfer, and mix thoroughly. Add about 50 g of sample, accurately weighed, to the first flask, and... 

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