132. How many grams of lead chloride can be dissolved in 300 ml of 0.1 mol/l aqueous sodium chloride solution? The ionic strength of the solution is...
179. Sediment contains barium sulfate and mercury(I) chloride. Specify which reagent should be used to separate barium and mercury(I) cations: A...
190. Write the reaction equation for the interaction of tin (II) and bismuth (III) in an alkaline medium.
200. How will the real redox potential of the Co3 │Co2 redox pair change compared to the standard redox potential if the activity of the oxidized...
220. Calculate the equilibrium constant of the reaction at room temperature 2I– Cl2 ↔ I2 2Cl– When calculating, use the table. 33 Handbook [3].
260. What minimum concentration of sulfide ions must be created in an aqueous 0.2 mol/l solution of potassium tetrathiocyanatoargentate(I)...
270. From the substances listed below, select reagents for the detection of the following ions: 1. Mn2 A. potassium iodide 2. Bi3 V. alizarin 3. Al3...
310. Calculate Rf and RS for alanine using the following chromatographic separation data: the distance from the start line to the finish line is 50...
335. What should be the mass of a sample of calcium chloride hexahydrate, so that the mass of the gravimetric form of calcium sulfate is equal to 0.2...
355. Calcium ions are precipitated with an equivalent amount of sulfuric acid. How many grams of calcium will remain in 350 ml of solution?
375. Calculate the mass of phosphoric acid in solution if the mass of the gravimetric form of magnesium pyrophosphate Mg2P2O7 was 0.4053 g.
445. To what volume should 100 ml of a hydrochloric acid solution with a molar concentration of 0.5 mol/l be diluted to obtain a solution with a...
475. In what volume should 0.8917 g of chemically pure be dissolved? potassium iodate to obtain a solution with a titrimetric conversion factor for...
486. Calculate the correction factor of 0.1 mol / l sodium hydroxide solution, if 18.15 ml of titrant solution was used to titrate a sample of...
516. A portion of a sample containing copper (II), weighing 3.1012 g, was dissolved in a volumetric flask with a volume of 100.0 ml. An aliquot of...
526. Calculate the pH of the first equivalence point when titrating 10.00 ml of a sodium carbonate solution with a molar concentration of 0.1 mol / l...
1. Calculate the work of adhesion of a liquid to glass, if the contact angle is 90°, the surface tension of this liquid is 75 mJ/m2. Find the...
2. When processing data on nitrogen adsorption on the adsorbent at 77 K using a graph corresponding to the linear BET equation, it was found that the...
3. Calculate the rate constant of rapid coagulation of the kaolin suspension according to the kinetics of coagulation at 293 K. τ, min 0 4 7 10 16 20...
4.Plot a titration curve 0.2M Na2CO3 0.38M HCl
5. Qualitative analysis of NiS FeS
6.Quantitative analysis of NiS+ FeS
7. The surface tension of a solution of acetic acid with a concentration (C \u003d 0.125 mol / l) at 298 K is 70.9 * 10-3 N / m, and the surface...
9. In the CO system Cl2 = COCl2, the concentration of CO was increased from 0.3 to 1.2 mol/l, and the concentration of chlorine from 0.2 to 0.6...
16. Based on experimental data, determine the constants in the Langmuir equation: Equilibrium concentration, mmol/l 88.7 177.7 260.0 Adsorption...