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

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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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35 mL of distilled water was added to 15 mL of 0.5 mol/L aqueous ammonia solution. Specify the molar concentration of the equivalents of the resulting solution.

Choose the correct answer : a. 0,30 b. 0,25 c. 0,25 d. 0,20 e. 0,15...

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

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Specify the pH of the sodium-acetate buffer, which is composed of 300 mL of 0,75 M acid solution and 280 mL of 1,5 M salt solution. Ka = 1,75×10-5

Выберите один ответ: a. 4,03 b. 6,03 c. 4,61 d. 5,03 e. 5,61...

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

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

Выберите один или несколько ответов: a. P2O5 b. SO3 c. NO2 d. SO2 e. NO f. N2O5 g. Cl2O5 h. CO2...

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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