Specify the substance (s) in whose aqueous solutions equilibrium dissociation occurs

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Using the table of dissociation constants, specify the correct sequence of substance numbers in order of increasing pH of their solutions (c=1 mol/L) 1 sulfuric acid 2 potassium carbonate 3 aluminum chloride 4 potassium thiocyanide 5 perchloric acid

Выберите один ответ: a. 53421 b. 43215 c. 51342 d. no right answer e. 54231...

asked Jan 20 in MCQs by Dr. Ahmed Hafez (500 points)

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Specify the substance (s) that form a buffer when sodium carbonate is added to an aqueous solution

Выберите один или несколько ответов: a. СО2 b. CaCO3 c. K2HPO4 d. KH2PO4 e. KHCO3 f. K2CO3 g. NaHCO3 h. CO...

asked Jan 20 in MCQs by Dr. Ahmed Hafez (500 points)

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6 grams of anhydrous sulfuric acid were dissolved in 250 mL of distilled water. Specify the concentration value (s) of the resulting solution. The volume of the dissolved substance should be neglected. The density of the solution is considered equal to 1 g / mL.

Выберите один или несколько ответов: a. 0,478М b. 2,34% c. 6,0% d. 0,239N e. 0,478N...

asked Jan 20 in MCQs by Dr. Ahmed Hafez (500 points)

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Based on the data on the composition of the formate (formic) buffer, specify which of the solutions can be added least of all sulfuric acid, in order not to change the pH significantly

Выберите один ответ: a. 125 mL 0,5М НСООН + 150 mL 0,75М HCOONa b. 100 mL 0,75М НСООН + 175 mL 0,5М HCOONa c. 115 mL ... mL 0,55М HCOONa d. 125 mL 0,75М НСООН + 150 mL 0,55М HCOONa...

asked Jan 20 in MCQs by Dr. Ahmed Hafez (500 points)

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For the reaction NH3(g) + HCl(g) = NH4Cl(s), ΔН<0, establish a correspondence between the direction of the equilibrium shift and the influence factors

[ no shift - shift left - shift right - no shift - shift right ] catalyst cooling heating addition of ammonium chloride pressure increase...

asked Jan 20 in MCQs by Dr. Ahmed Hafez (500 points)

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