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2-The pH of a 0.02 M solution of an unknown weak acid is 3.7. what is the pK, of this acid? (c) 3.2 (a) 5.7 (b) 4.9 (d) 2.8 (e) 3.7

2-The pH of a 0.02 M solution of an unknown weak acid is 3.7. what is the pK, of this acid? (c) 3.2 (a) 5.7 (b) 4.9 (d) 2.8 (e) 3.7

Chemistry
Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Q1:Chose the correct answer from the following 1-The [HO] in a 0.050 M solution of Ba(OH), is: (a) 1.0 x 10' M (b) 5.0 x 10 M (c) 10 x 10 M (d) 5.0 x 10" M 2-The pH of a 0.02 M solution of an unknown weak acid is 3.7. what is the pK, of this acid? (a) 5.7 (b) 4.9 (d) 28 (c) 3.7 3-Which of the following solutions has the lowest pH at 25°C? (No calculations required.) (a) 0.2 M sodium hydroxide (b) 0.2 M hypochlorous acid (c) 02 M ammonia (d) 0.2 M benzoic acid (e) pure water 4-The pH of 0.15 M trimethylammonium chloride, (CH)NHCI, a salt, is 5.34. What is the percent hydrolysis? (a) 0,003% (b) 0.0068% (c) 0.0094 % (c) 0.022% (d) 0.011 % 5-How many grams of NaF would have to be added to 2.00 L of 0.100 M HF to yield a solution with a pH is 4.00% mw for NaF is 41.98 g/mol) Ka for HF 1.4 10 (a) 300 g (b) 36 g (c) 0.84 g (d) 6.9 g (c) 60. g 6-Calculate the pH of the solution resulting from the addition of 20.0 mL of 0.100 M NaOH to 30.0 ml. of 0.100 M HNO, (a) 1.35 (b) 1.70 (c) 1.95 (d) 2.52 (c) 2.80 7-Consider the titrations of the pairs of aqueous acids and bases listed on the left. For which pair is the pH at the equivalence point stated incorrectly? Acid-Base Pair tai balls (b) HNO-Ca(OH) (e) 2.0 x 10¹ M (HCIO, -NaOH id) HCO NaOH KHOA pH at Equivalence Point less than 7 (a) strong, strong (b) weak, strong (c) strong, weak (d) weak, weak (e) none of these less than 7 8-The following titration curve is the kind of curve expected for the titration of a base pH 71 acid with a mL added 9- A buffer system is set up with 3[HA] =[A]. If pK a -5.5, what is the pH of the buffer? c. 5.3 a. 5.2 b. 3.5 d. 6.0 e. 7.5 10-If 25.00 ml of 0.1M NaOH solution is needed to reach the end point of 10 ml HNO₂. Then the concentration of HNO, in ppm is: [M.wt. of HNO,-63 g/mol] a. 9.45-10 ppm b. 14.70×10 ppm c. 7.30-10¹ ppm d. 1.5750×10 ppm
Transcribed Image Text:Q1:Chose the correct answer from the following 1-The [HO] in a 0.050 M solution of Ba(OH), is: (a) 1.0 x 10' M (b) 5.0 x 10 M (c) 10 x 10 M (d) 5.0 x 10" M 2-The pH of a 0.02 M solution of an unknown weak acid is 3.7. what is the pK, of this acid? (a) 5.7 (b) 4.9 (d) 28 (c) 3.7 3-Which of the following solutions has the lowest pH at 25°C? (No calculations required.) (a) 0.2 M sodium hydroxide (b) 0.2 M hypochlorous acid (c) 02 M ammonia (d) 0.2 M benzoic acid (e) pure water 4-The pH of 0.15 M trimethylammonium chloride, (CH)NHCI, a salt, is 5.34. What is the percent hydrolysis? (a) 0,003% (b) 0.0068% (c) 0.0094 % (c) 0.022% (d) 0.011 % 5-How many grams of NaF would have to be added to 2.00 L of 0.100 M HF to yield a solution with a pH is 4.00% mw for NaF is 41.98 g/mol) Ka for HF 1.4 10 (a) 300 g (b) 36 g (c) 0.84 g (d) 6.9 g (c) 60. g 6-Calculate the pH of the solution resulting from the addition of 20.0 mL of 0.100 M NaOH to 30.0 ml. of 0.100 M HNO, (a) 1.35 (b) 1.70 (c) 1.95 (d) 2.52 (c) 2.80 7-Consider the titrations of the pairs of aqueous acids and bases listed on the left. For which pair is the pH at the equivalence point stated incorrectly? Acid-Base Pair tai balls (b) HNO-Ca(OH) (e) 2.0 x 10¹ M (HCIO, -NaOH id) HCO NaOH KHOA pH at Equivalence Point less than 7 (a) strong, strong (b) weak, strong (c) strong, weak (d) weak, weak (e) none of these less than 7 8-The following titration curve is the kind of curve expected for the titration of a base pH 71 acid with a mL added 9- A buffer system is set up with 3[HA] =[A]. If pK a -5.5, what is the pH of the buffer? c. 5.3 a. 5.2 b. 3.5 d. 6.0 e. 7.5 10-If 25.00 ml of 0.1M NaOH solution is needed to reach the end point of 10 ml HNO₂. Then the concentration of HNO, in ppm is: [M.wt. of HNO,-63 g/mol] a. 9.45-10 ppm b. 14.70×10 ppm c. 7.30-10¹ ppm d. 1.5750×10 ppm
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