pH is a measure of concentration of hydrogen ions (H+) in a solution. Mathematically it is the negative logarithm of concentration of hydrogen ions, that is pH = -log [H+] .
Ques 15.
HClO4 will dissociate in solution as : HClO4 → H+ + ClO4 -
Thus 1 mole of HClO4 will produce 1 mole of H+ ions which means concentration of H+ ions produced by HClO4 is same as the concentration of HClO4 .
Given concentration of HClO4 = 0.026 M
Thus concentration of H+ ions is also 0.026 M , that is [H+] = 0.026M
Therefore pH = -log (0.026) = - (-1.585) = 1.585 = 1.59 ( by rounding off)
Thus option a is the correct answer.
Ques 16.
HCl dissociates in solution as : HCl → H+ + Cl-
Thus concentration of H+ ions produced by HCl is same as the concentration of HCl since 1 mole of HCl produces 1 mole of H+.
Given concentration of HCl = 0.045 M
So concentration of H+ ions in the solution is also 0.045 M , that is [H+] = 0.045 M
Thus pH = -log (0.045) = - (-1.346) = 1.346 = 1.35 (by rounding off)
Thus option d is the correct answer.
WILSPILUIS SUSITIU 41722 Tourse o 25 1650 TocontentId = Question Completion Status: QUESTION 15 Calculate the...
explain 21,22,23 UTILIT In this solution is a. 2.6 x 10-1° M b. 3.8 x 10 M c. 9.58 d. 4.42 e. none of these 21. How many moles of pure NaOH must be used to prepare 1.0 L of a solution that has pH = 12.26? a. 8.2 x 10-16 mol b. 0.018 mol c. 5.5 x 10-13 mol d. 1.74 mol e. none of these 22. Calculate the pH of a 0.045 M HCl solution. K a. 1.23...
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Question Completion Status: Question 14 Write the equlibrium expression, Kc, for the following equation. 4 HCl(aq) + O2 =2 H2O(l) +2 C12 ) K- [CI_1? [H2012 [HCI [02] [C212 K- HCI* (0) [HCI (0) [C1, 12 [CI, 12 [HCM K- Moving to another question will save this response esc 99% # 3 $ 4 % 5 & 7 1 2 6 8 Q W E 70 T Y U tab A S D F G H J caps lock N...
23, (4 points) Calculate the pH of a 2.6 × 10-2 M solution of KOH (aq). A. 12.41 B. 15.59 C. 2.06 D. 7.00 E. 1.59
Question Completion Status: QUESTION 28 The pH of a solution prepared by mixing 50 mL of 0.183 M KOH and 35.0 mL of 0.145 M HCl is Hints: the acid-base reaction is following: H(aq) + OH(aq) → H200) + NaCl(aq) 0.0051 mol of OH- is remaining after adding HCl into KOH and the total volume of the mixing solution is 0.085 L (85 mL = 50 ml + 35 mL) 1.314 OA 1.403 08 0.00824 oc 12.597 OD 12.778 08...
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Question Completion Status: QUESTION 16 Which one of the following pairs cannot be mixed together to form a buffer solution? NH3, NH4Cl NaC2H302, C2H302H (C2H302- = acetate) B. O NaF, HF O D.NaCl, HCI H3PO4, KH P04 OE QUESTION 17 colmats the facoltinn hat er da Hand Min Click Save and sharque and submit. Click Save to say all are Remaining Time: 1 hour, 21 minutes, 41 seconds. Question Completion Status: Let's suppose that the pH of a solution of...
W ackboard Remaining Time: 23 minutes, 58 seconds. Question Completion Status: QUESTION 15 Which of the following is FALSE for a 0.150 M solution of a weak base with a kb - 1.40x10? The equilibrium concentration of hydroxide ions is 4.58x10-3M The solution would have a pH = 11.66. The equilibrium concentration of the conjugate acid would be 9.16x103 M. The conjugate acid would have a Ka - 7.14x10-11 The equilibrium concentration of the base would be 0.145 M. QUESTION...