Potassium Nitrate Solution

Organic matter Hot concentrated sulfuric acid plus a few drops of sodium or potassium nitrate solution. 

The hot potassium nitrate solution is drawn through the crystalline NaCl and the KNO3 is isolated. SolubiUty data for KNO3 ia water are presented ia Table 16. 

Lead is not generally attacked rapidly by salt solutions (especially the salts of the acids to which it is resistant). The action of nitrates and salts such as potassium and sodium chloride may be rapid. In potassium chloride the corrosion rate increases with concentration to a maximum in 0.05m solution, decreases with a higher concentration, and increases again in 2m solution. Only loosely adherent deposits are formed. In potassium bromide adherent deposits are formed, and the corrosion rate increases with concentration. The attack in potassium iodide is slow in concentrations up to 0.1m but in concentrated solutions rapid attack occurs, probably owing to the formation of soluble KPblj. In dilute potassium nitrate solutions (0.001 m and below) the corrosion product is yellow and is probably a mixture of Pb(OH)2 and PbO, which is poorly adherent. At higher concentrations the corrosion product is more adherent and corrosion is somewhat reduced Details of the corrosion behaviour of lead in various solutions of salts are given in Figure 4.16. 

The relatively large values of Vmax indicate, however, that the separation will be lengthy and the elution bands broad, particularly for the bromide band. The use of a more concentrated solution of eluant significantly reduces the values °f Vmax and the elution bands become much sharper. Thus the distribution coefficient for bromide using a 0.35M potassium nitrate solution is 6.5 and using the same column, Vmax = (6.5 x 4) + 4 = 30 mL. 

Ammonium iron(II) sulphate solution, ca 0.4M. Dissolve about 15.6 g, accurately weighed, of ammonium iron(II) sulphate in 100 mL of Solution A. Potassium nitrate solution, ca 0.3 M. Dissolve about 3.0 g, accurately weighed,... 

Absorbance scale. This can be checked by using one or more standard solutions which have been carefully prepared examples include potassium dichromate in either acid or alkaline solution, and potassium nitrate solution. Full details of recommended standard solutions and of their standard absorption values are given in Ref. 19. 

The absorbance and the percentage transmission of an approximately 0.1M potassium nitrate solution is measured over the wavelength range 240-360 nm at 5 nm intervals and at smaller intervals in the vicinity of the maxima or minima. Manual spectrophotometers are calibrated to read both absorbance and percentage transmission on the dial settings, whilst the automatic recording double beam spectrophotometers usually use chart paper printed with both scales. The linear conversion chart, Fig. 17.18, is useful for visualising the relationship between these two quantities. 

Figure 4 The variation of the zeta potential of vitreous silica as a function of pH in potassium nitrate solutions. (Based on Wiese, G. K., James, R. O., and Healy, T. W., Trans. Farad. Soc., 52, 1298, 1971.)...

Ag+ + e Ag is the simplest reaction which can be studied easily in a potassium nitrate solution. In any metal ions metal reaction, Cr C0o, and the theoretical expression in Eq. (9) reduces to43... 

The content of C3H5N309 may be calculated from the values of the extinctions thus obtained. Each ml of the potassium nitrate solution is equivalent to 0.1 mg of C3H5N309. 

Soak the strips of filter paper in 2 mL of potassium nitrate solution. These are the salt bridges... 

In potassium nitrate solution (1M KN03, pH 7) the forward reaction rate for N-doped CNFs was approximately 5 10 6 cms-1 and 3 10 8 cms 1 for non-doped CNFs. In potassium hydroxide solution (1M KOH, pH 14), the forward reaction rate was - 1.8 10-5 cms-1 and 1 10-7 cms-1 for N-doped and non-doped CNFs respectively. Thus, in both neutral and alkaline solutions, N-doped CNFs exhibited a 100-fold increase in H202 decomposition [180], with values similar to Pt black [181],... 

Note Instead of using the potassium nitrate solution, Wilson (Ref 1) recommends the use of aqueous solutions of sulfuric acid. The following table gives the strength of H2SO4 required to give different relative humidities (RH) at various temperatures... 

The general utility of this process was outlined by R. Lorenz1 in 1896. He employed a bath of alkali chloride, nitrate or sulphate, with a platinum cathode and an anode of that metal, the hydroxide of which was to be precipitated. This investigation established the following facts In potassium chloride solution, a copper anode gives yellowish cuprous hydroxide, whilst in a potassium nitrate solution... 

What volumes of water and potassium nitrate solution are used ... 

Assay Dissolve about 250 mg of sample, dried at 105° for 2 h and accurately weighed, in 150 mL of water. Add 1 mL of nitric acid, and immediately titrate with 0.1 N silver nitrate, determining the endpoint potentiometrically, using silver-calomel electrodes and a salt bridge containing 4% agar in a saturated potassium nitrate solution. Perform a blank determination, and make any necessary correction (see General Provisions). Each milliliter of 0.1 N silver nitrate is equivalent to 7.455 mg of KCl. 

In a simplified form of the silver coulometer, which is claimed to give results accurate to within 0.1 per cent, the amount of silver dissolved from the anode into a potassium nitrate solution during the passage of current is determined volumetrically. ... 

Kolthoff and Lingane [ J, Phys. Chem., 42, 133 (1938)] determined the solubility of silver iodate in water and in the presence of various concentrations of potassium nitrate at 25°. The solubility in pure water is 1.771 X 10 mole per liter, and the following results were obtained in potassium nitrate solutions ... 

Boiling with potassium nitrate solution causes lead chromate to pass into the colloidal state. ... 

An aqueous potassium nitrate solution containing 60.0 wt% KNO3 at 80°C is fed to a cooling crystallizer in which the temperature is reduced to 40 C Determine the temperature at which the solution reaches saturation and the percentage of the potassium nitrate in the feed that forms crystals. 

The cotton strands are sometimes boiled in potassium nitrate solution in water so that the fire is not extinguished where there are creases in the match. 

Figure 5 Apparent molar volume of potassium nitrate solutions calculated with Masson s rule (22), compared with experimental data...

Potassium Nitrate Solution (a). From molecular weight of KN03, 101.103 g KN03 contain 14.0067 gN. 

The solubility of potassium nitrate is 40 g/100 g of water at 25°C. What is the mass percent of saturated potassium nitrate solution at the same temperature ... 

In this case, So is 1.771 X 10 mole liter , and since silver iodate is a uniunivalent salt, this is also the value of In the potassium nitrate solution, is, as... 

By means of the Debye-Htickel theory, calculate the activity coefficients of silver iodate in the various potassium nitrate solutions mentioned in Exercise 14, Chapter XVI. Compare the values with those derived from the observed solubilities. 

Use labeled microtip pipets to put six drops of sodium acetate solution in Al, potassium nitrate solution in A2, ammonium chloride solution in A3, sodium carbonate solution in A4, sodium chloride solution in A5, and aluminum sulfate solution in A6 of a 24-well microplate. 

In the presence of 0.1 mol dm 3 potassium nitrate solution, electrochemical depletion of Ag+ in the tip-substrate gap induces the dissolution of AgCl. As Cl is electroinactive at the tip potential of interest, its concentration increases in the tip-substrate domain during the period of the chro-noamperometric measurement. This results in dissolution into an environment, which is spatially and temporally nonstoichiometric with respect to the lattice ions of the solid material. Theoretically, the dissolution behavior is now a two species problem, which is described by the following tip electrode and substrate boundary conditions (6) ... 

A potentiometric titration method for obtaining the solubility of silver chloride in potassium nitrate solutions has been used by Brown and Maclnnes.28 These workers used the cell... 

The following example of advective transport in the presence of a cation exchanger is derived from a sample calculation for the program phreeqm (Appelo and Postma, 1993, example 10.13, pp. 431 134). The chemical composition of the effluent from a column containing a cation exchanger is simulated. Initially, the column contains a sodium-potassium-nitrate solution in equilibrium with the cation exchanger. The column is then flushed with three pore volumes of calcium chloride solution. Calcium, potassium, and sodium react to equilibrate with the exchanger at all times. 

The solubility of ethylene in aqueous silver nitrate and potassium nitrate solutions has been measured 49> at 30 °C and 0.945 atm. ethylene partial pressure to determine the zero ionic strength association constants for the following reactions... 

This paper reports cryoscopic measurements for NiS04 aqueous solutions in saturated potassium chlorate solution (freezing point 272.55 K) and saturated potassium nitrate solution (freezing point 270.32 K). The eutectic freezing point depressions, AT, are between 0.0296 K and 0.178 K. Thus, together with the measurements reported in [56KEN], the variation in the complexation constant, K, with ionic strength was examined. 

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