Calculate the acidity of the solution if pH=4,32

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Calculate the acidity [H+] and the pH value of the 0,35 mol/L formic acid solution using the dissociation constant Ka = 1,8×10-4

Выберите один ответ: a. 3,01 b. 0,00794 c. 2,1 d. 3,1 e. 1,1 f. 0,0794 g. 0,00079 h. 0,7937...

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

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Calculate the acidity [H+] and the pH value of the solution of 0.33 mol /L of lactic acid, if α=5.3×10-2

Выберите один ответ: a. 1,076 b. 0,075 c. 2,02 d. 0,0175 e. 2,76 f. 0,033 g. 1,76 h. 0,0018...

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

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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 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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Calculate the weight of the sample of crystalline soda Na2CO3 × 10H2O, which must be dissolved in a volumetric flask with a volume of 1000 mL, to obtain a mass fraction of the solute of 7%, with a density of 1.05 g /mL

Choose the correct answer: a. 7,35g b. 75,3g c. 19,83g d. 73,5g e. 198,3g...

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

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