Glinka Problem 454
454. 4.62 L of H2S dissolves in 1 liter of water at 0 °C. At what pressure must H2S be dissolved to obtain a 5% (by weight) solution?
Solution to task 454 from Chertov's for extramural stud
454. A single-layer winding (turn to turn) of wire with a diameter of d = 0.2 mm is laid on a long cardboard frame with a diameter of D = 5 cm...
FEFU WEBDidactor Land law - 2 questions #454
FEFU Land law Pavlenko Natal_a Eduardovna Computer Exam - Land law - Zacteno 1. Poradok oformlenia zemel_nogo ucastka v sobstvennost_ fiziceskogo...
104. Solving a chemistry problem
13. For water containing nickel chloride, with an acidity of 1.0 mmol/l, choose a reagent for the complete neutralization of water and calculate the...
104. Solving a chemistry problem
23. Which of the salts causes water alkalinity: sodium nitrate, sodium sulfide, lead nitrate? Write the hydrolysis equation for this salt.
91. Solving a chemistry problem
28. Calculate the surface tension of oleic acid if its spreading coefficient in water is 24.5 mJ/m2. The surface tension of water is 72.5•10-3 J/m2...
91. Solving a chemistry problem
To determine nickel with dimethylglyoxime, a sample of steel is dissolved and the solution is diluted to 100.0 ml. The necessary reagents are added...
91. Solving a chemistry problem
For a reaction that occurs reversibly in a galvanic cell, an equation is given for the dependence of EMF on temperature. At a given temperature...
91. Solving a chemistry problem
What percentage of iron (II) remained untitrated when titrated with potassium permanganate if the titration was completed at a platinum electrode...
84. Solving a chemistry problem
5. Write down the reactions on the electrodes occurring in the Pb,PbSO4solid/CuSO4(m=0.02)/Cu HE.
84. Solving a chemistry problem
6. Determine the activity of cadmium ions, at which the direction of the current in the cell is reversed: Fe/ Fe2 (a=0.6)//Cd2 (a=x)/Cd
84. Solving a chemistry problem
A mixture of hydrochloric and boric acids was titrated potentiometrically with 0.1000 M NaOH sequentially: first, HCl was titrated (having consumed...
84. Solving a chemistry problem
Determine the optical density and transmission of the KMnO4 solution, if the mass concentration of the solution is 0.05 g / mol, the thickness of the...
84. Solving a chemistry problem
18. How many moles of nitrogen atoms are there in 16 g of ammonium nitrate?
84. Solving a chemistry problem
438. Calculate the equilibrium constant Keq. chemical reaction at T = 1000 K, if the standard Gibbs energy of the reaction at this temperature is...
84. Solving a chemistry problem
528. The dissociation constant of phosphoric acid in the first stage is 7.11∙10-3. Neglecting dissociation in other steps, calculate the...
84. Solving a chemistry problem
558. Calculate the apparent degree of dissociation of barium hydroxide in a solution with a molar concentration equivalent of 0.0156 mol/l if the...
84. Solving a chemistry problem
2. Calculate the pH of the solution obtained after adding 800 ml of 0.01 M HCOONa solution to 1 liter of 0.01 HCOOH solution.
54. Solving a chemistry problem
33. Give all possible reactions for testing the authenticity of all components of the prescription. Propose a scheme for quantitative analysis...
44. Solving a chemistry problem
24. Describe the procedure for conducting sedimentation analysis by continuous weighing. Calculate the maximum particle size according to the results...
34. Solving a chemistry problem
203. How does the atmospheric corrosion of iron coated with a layer of silver proceed if the coating is broken. Compose the electronic equations of...
24. Solving a chemistry problem
In problems 45, write molecular, ionic, and abbreviated ionic equations for the reactions that occur between the following compounds: 45. a) silver...
14. Solving a chemistry problem
4. Tablets of acidin-pepsin, when introduced into the stomach, are easily hydrolyzed, releasing free hydrochloric acid. When titrating 25 cm3 of the...
4. Solving a chemistry problem
12. Determine the thermal effect of chemical reaction A at temperature T. Use the table of functions (H0T¬-H0298) from the appendix to calculate...