FEFU Economy of the state and municipal sector Spak Aleksandr Sergeevic Computer Exam - Economy of the state and municipal sector - Udovletvoritel_no...
30. Calculate the pH of an acetate buffer mixture containing 0.10 mol of acid and salt. How will the pH change when 0.01 mole of acid is added to 1...
40. How many ml of a 5% solution of BaCl2 should be taken to precipitate the sulfate ion from 10.00 ml of a 1% solution of sulfuric acid?
50. What weight of KOH should be taken so that 20 ml of HCl solution with a KOH titer of 0.0040 mg/ml is used for its titration.
60. A weighed sample of 0.1535 g of magnesium oxide was dissolved in 40.00 ml of hydrochloric acid with a titer of 0.003646 g/ml. For titration of...
70. What should be the weight of the ore containing 52.30% iron, so that after dissolving it and reducing Fe3+ to Fe2+, 25 cm3 of a 0.1000 N solution...
80. From 0.5100 g of ore, after a series of operations, copper was transferred into solution in the form of a copper (II) salt. When an excess of...
84. Solubility of CO2 in water at n.o.s. was 1.7 liters per 1 liter of water. Determine C% CO2 in saturated solution.
86. Does a precipitate fall out when draining: 0.5 L 10–6 M silver nitrate and 1 L 10–5 M potassium bromide
86. Using the energy diagrams of the particles O22–, O20, show which of them is characterized by the minimum strength of the O–O bond.
128. Write the reaction equations and indicate the pH (<7, equal to 7, >7) of aqueous solutions of the following salts (without calculation)...
135. Determine CH, CM, C%, T, ni of dissolved substances in a 1.18 mol solution of Fe2 (SO4) 3 (ρ \u003d 1.13 g / cm3).
195. For chlorination of 62.8 g of a mixture of aluminum and zinc, 31.36 liters of chlorine (n.o.) were used. The resulting mixture of chlorides was...
2. The dissociation constant of nitrous acid is 5×10-4. Calculate the degree of dissociation (α) and the equilibrium concentration of hydrogen ions...
2. Calculate solubility (mol/l): Iron(III) orthophosphate
2. Calculate the hydrolysis constant, degree of hydrolysis and pH of the medium: 0.01 N sodium formate solution
5. Determine the amount of substance of phosphorus atoms in phosphorite CA3 (PO4) 2 weighing 155 g.
440. During the electrolysis of a cadmium salt solution, 3434 C of electricity was consumed, 2 g of cadmium were released. What is the molar mass of...
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5. Calculate the excess adsorption of nonanol and construct an adsorption isotherm from the dependence σ=f(c) of its aqueous solutions at T=293K. s...
1. Determine the concentration of zinc (mg/l and mg-eq/l) in the test solution, if during amperometric titration of 10.00 ml of this solution with a...
6. For the reaction indicated in Table 6, taking into account the initial data, calculate the equilibrium constants Kp, Kc and Kx, and also determine...
280. With a sufficiently slow introduction of substance B into a dilute solution of substance A, the formation of a hydrosol of substance C is...
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