How can I make aqueous solution of Bi(NO3)3.5H2O for electrodeposition with pH 3-4?

Afan, I do not know the reasons why this will work (Bi (OH) 3 !!!): This is not an easy method, but you need to control the pH beforehand.

Tantalum was electrodeposited on the planar substrates of deposited Au and polycrystalline Cu using various deposition potentials. All sediments were made from 0 mol / L HNO 3 and 0.10 mol / L Bi (NO 3) 3. Coverage and surface morphology of the deposited films were characterized using FE - EM. FIG. 10 shows the surface of 0 and 15 μm film on u and Cu, and the film deposited on -0.50.50 V 0.0 μm crystallized with a particle size of 1 to 2 μm. This 15 μm film has the same nodule morphology as a 0 μm thick film except that the hat has an average particle size of about 4 times. FIG. 10 shows that the surface morphology is the same for deposits on polycrystalline Cu substrate and deposited Au substrate. Deposition Conditions In the Bi (NO 3) 3 solution of 0.10 mol / L, the reversible potential of Ismuth is about 0.45 V with respect to SSE. Precipitates produced with a precipitation potential of 0.50 V have an average "white-white".

Electrodeposition of Bi from acidic nitrate solution was investigated. Based on the integration of precipitation and dissolution voltammetry, it is determined that ruthenium precipitation is quasi-reversible on Au with 100% efficiency. In Bi and Au, no interference of nitrate reduction was observed, and nitrate reduction occurred on the W and Cu electrodes. Analysis of the current-time transient clearly shows that the nucleation on Au is constant. Field emission SEM shows a nodular deposit with moderate surface roughness. The size of tuberculosis ranges from 1 to 5 microns depending on the deposition ability and the thickness of the sediment. The X-ray diffraction (XRD) pattern of all sediments is directed to diamond ◇. At high deposition excess potential, the deposit has a fairly strong (0 12) crystal structure.

Obtain a stock solution of catalase solution 1. Weigh 40 mL of enzyme solution in 11 50 mL beakers labeled as follows: pH 2, pH 3, pH 4, pH 5, pH 6, pH 7, pH 8, pH 9. pH 10, pH 11 and pH 12. 10 mL of a 1 molar solution of each pH was added to each appropriate beaker. A second set of eleven 50 mL beakers was obtained and labeled the same as the first set. In these beakers 40 mL of 1% H 2 O 2 solution was weighed. These are used as reaction beakers. Using the puncher, punch the "dish" of the filter paper. One dish at a time, the dish was soaked in the catalase solution for 5 seconds. The tray was then blotted dry on a paper towel for 5 seconds. The disk was quickly soaked in the substrate solution (H 2 O 2) and placed on the bottom of the beaker. The reaction time is measured as the time from ejection of the disc until it is laid flat on the surface of the solution.