Answer
12 (1 Point) Consider the following equilibrium for an acid-base indicator: Hind H+ + Ind K...
5 (1 Point) Consider the following equilibrium for an indicator: Hind + H2OH,0* + Indº Which two species must be of two different colours in order to be used as an indicator? A. Hind and H2O B. Hind and Ind C. H,O* and Ind D. Hind and H,0* E. H2O and Ind ОА НОВ с Ο Ε
11 ** (1 Point) A new indicator, "B.C.Blue (Hind)", is red in bases and blue in acids. Describe the shift in equilibrium and the resulting colour change if 1.0 M HIO, is added to a neutral, purple solution of this indicator Hind + H2O = H,0* + Ind A. Equilibrium shifts left, colour becomes red. B. Equilibrium shifts left, colour becomes blue, C. Equilibrium shifts right, colour becomes red. D. Equilibrium shifts right, colour becomes blue. E. Equilibrium does not...
Methyl orange is an indicator with a Ka of 1 x 10-4. Its acid form, HIn, is red, while its base form, In-, is yellow. At pH 7.0, the indicator will be___________. a. red. b. orange. c. yellow. d. blue. e. not enough information
18 * (1 Point) An indicator changes colour in the pH range of 6.40 - 7.20. What is the K, for this indicator? a) 4.0 x 107 b) 1.6 x 10-7 c) 0.80 d) 6.80 A 0 Ос OD
12. Given that Ka = 1.8 x 10- for acetic acid. in order for an acetic acid solution to have a pH of 3.50, its molar concentration must be a. 5.7 x 10-3 M b. 5.6 x 10-3M c. 3.2 x 10-4M d. 2.3 x 10-M 13. If enough base is added to a solution to cause the pH to increase from 7.50 to 8.50, this means that А a. [OH-] increases by a factor of 10 b. [H'] increases...
Question 22 (1 point) The K, of hypochlorous acid (HCIO) is 3.0 * 10-at 25.0 "C. Calculate the pH of a 0.0385 M hypochlorous acid solution (pH of a weak acid - with approximation, [H,0") Sort (K, Cal; where CHA is weak acid concentration) A) 9.53 B) 3.05 C) 6.52 D-3.05 E) 4.47 Question 23 (1 point) A particular first-order reaction has a rate constant of 1.35 "C. What is the magnitude of kat 75.0 "CIT 105 at 25.0 (Use...
6) Which of the following statements is true? A) If Q = K, it means the reaction is not at equilibrium B) If Q< K, it means the forward reaction will proceed (to the right) to form more reactants. C) If Q< K, it means the reverse reaction will proceed (to the left) to form more reactants. D) If Q> K, it means the forward reaction will proceed (to the right) to form more reactants E) If Q> K, it...
14 (1 Point) What is the [H,0*) at the transition point for an indicator with a K of 3.9 x 10-8? A. 1.0 x 10-14M B. 3.9 x 10-8M C. 1.0 x 10-7M D. 2.6 x 10-7M DA B
Ch 17 Ee 12 Weak Acid/Strong Base: Example 8: An acid-base titration experiment begins with 20.0 ml of 0.200 M HF in the flask and 0.160 M NaOH in the burer. Ka for HF-6.3 x 10-4. Draw the expected titration graph where pH is the y axis and ml of NaOH added is the x axis, Sketch and label the titration curve including WA or WB, SA or SB, salt, equivalence pt. pH at equiv pt <-, or > 7....
A weak acid is titrated with a strong base and the pH vs. volume plot is shown. Approximately what is denoted with B)? A) The equilibrium of the acid B) The starting pH C) The equivalence point D) The end point E) The pKa of the weak acid D) pH B) A) Volume titrant added O E OB OA Ос OD о Bi E A weak acid is titrated with a strong base and the pH vs. volume plot is...