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![Ans: Given, pH range = 6*40-720 hui, Hm be a indicator Hn ♡ Н + In ... K Ka = [ht] [w] [Him] when [lm] = [Hm] colour change .](http://img.homeworklib.com/questions/d221dbd0-e986-11ea-a2c6-a75322f85d95.png?x-oss-process=image/resize,w_560)
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18 * (1 Point) An indicator changes colour in the pH range of 6.40 - 7.20....
12 (1 Point) Consider the following equilibrium for an acid-base indicator: Hind H+ + Ind K...
12 (1 Point) Consider the following equilibrium for an acid-base indicator: Hind H+ + Ind K = 1.0 x 10-10 Which of the following statements is correct at pH 7.0 ? A. [Ind"] <[HInd] B. [Ind'] = [HInd] C. [Ind] > [HInd] D. [Ind] = [HInd] = [HT] E. KA = [H*] A B Ос OD E
26 (1 Point) When performing a titration experiment, the indicator must always have A. a distinct...
26 (1 Point) When performing a titration experiment, the indicator must always have A. a distinct colour change at pH = 7.0. * B. the ability to change from colourless to pink. C. a transition point that is close to the equivalence point. D. an equivalence point that is close to the stoichiometric point. OA OB Ос D
11a) 1.00 moles of lactic acid (HC2H5O3, Ka - 1.4 x 104) and 1.00 moles of...
11a) 1.00 moles of lactic acid (HC2H5O3, Ka - 1.4 x 104) and 1.00 moles of sodium lactate (NaC3H5O3) are dissolved in water resulting in a solution with a final volume of 550 mL. What is the pH of the solution after the addition of 0.080 moles of HCI? a. 0.80 b. 1.8 c. 2.8 d. 3.8 0 0 0 ΓΝ 5 nts 12a) Metacresol is a pH indicator which changes from yellow to purple at pH = 8.2. Which...
Universal indicator is a solution which contains several acid base indicators and provided sufficient color changes to estimate pH over a wide range. One such indicator contains a mixture of thymol bl...
Universal indicator is a solution which contains several acid base indicators and provided sufficient color changes to estimate pH over a wide range. One such indicator contains a mixture of thymol blue, phenolphthalein, and methl orange. Determine the color of this indicator at a) pH=1.5, b) pH=4, c) pH 6.5, d) pH=9, and e) pH=11.5. Explain reasoning.
14 (1 Point) What is the [H,0*) at the transition point for an indicator with a...
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
I'm having trouble with 1a, 1b, 1c and 2... pH, INDICATORS AND TITRATION CURVES PRE-LAB ASSIGNMENT: 1. A certain ind...
I'm having trouble with 1a, 1b, 1c and 2...
pH, INDICATORS AND TITRATION CURVES PRE-LAB ASSIGNMENT: 1. A certain indicator is blue at pH = 4.0, yellow at pH 6.0, and red at pH 8.0. a. How many pKin values will this indicator have? (Assume all its colour changes are given.) b. A solution with pH = 5.0 has some of this indicator added to it. What colour is the solution likely to become? c. What are the approximate pKin...
11 ** (1 Point) A new indicator, "B.C.Blue (Hind)", is red in bases and blue in...
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...
Assume an indicator works best when the equivalence point of a titration comes in the middle...
Assume an indicator works best when the equivalence point of a titration comes in the middle of the indicator range. For which of the following titrations would methyl red be the best indicator? The pH range of methyl red is 4.8 to 6.0. Select one: a. 0.100 M NH3 (Kb = 1.8 × 10–5) + 0.100 M HCl b. 0.100 M Sr(OH)2 + 0.100 M HI c. 0.100 M HF (Ka = 7.2 × 10–4) + 0.100 M NaOH d....
3. Insoluble metal hydroxides can be used as a "buffer" to resist changes in pH. For example, con...
3. Insoluble metal hydroxides can be used as a "buffer" to resist changes in pH. For example, consider the solution that would sul if 0.200 moles of MgCl2 are combined wih0.200 moles of NaOH in a total volume of 1.00 liter a) Determine the concentrations of all ionic species in this solution b) Calculate the pH of this solution c) You could add 0.040 moles of NaOH to the solution in part (a), causing additional Mg(OH)2 to precipitate. Calculate the...
D Question 4 5 pts 2b) There are 0.10 moles of N2O4 and 0.20 moles of...
D Question 4 5 pts 2b) There are 0.10 moles of N2O4 and 0.20 moles of NO 2 present in a 2.0 L container which may react according to: N2O4(g) = 2N028) Kp = 11 What is the value of Qp for the initial gas mixture? a. 4.0 b. 0.20 c. 0.40 d.5.0 . a. b. Consider the following equilibrium systems. Which direction will the reactions shift (reactants or products) when cooled? 200g + O2(g) = 2CO2(g) H2e+12(e)=2HI® H2(g) +126)...
12 (1 Point) Consider the following equilibrium for an acid-base indicator: Hind H+ + Ind K = 1.0 x 10-10 Which of the following statements is correct at pH 7.0 ? A. [Ind"] <[HInd] B. [Ind'] = [HInd] C. [Ind] > [HInd] D. [Ind] = [HInd] = [HT] E. KA = [H*] A B Ос OD E
26 (1 Point) When performing a titration experiment, the indicator must always have A. a distinct colour change at pH = 7.0. * B. the ability to change from colourless to pink. C. a transition point that is close to the equivalence point. D. an equivalence point that is close to the stoichiometric point. OA OB Ос D
11a) 1.00 moles of lactic acid (HC2H5O3, Ka - 1.4 x 104) and 1.00 moles of sodium lactate (NaC3H5O3) are dissolved in water resulting in a solution with a final volume of 550 mL. What is the pH of the solution after the addition of 0.080 moles of HCI? a. 0.80 b. 1.8 c. 2.8 d. 3.8 0 0 0 ΓΝ 5 nts 12a) Metacresol is a pH indicator which changes from yellow to purple at pH = 8.2. Which...
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
I'm having trouble with 1a, 1b, 1c and 2...
pH, INDICATORS AND TITRATION CURVES PRE-LAB ASSIGNMENT: 1. A certain indicator is blue at pH = 4.0, yellow at pH 6.0, and red at pH 8.0. a. How many pKin values will this indicator have? (Assume all its colour changes are given.) b. A solution with pH = 5.0 has some of this indicator added to it. What colour is the solution likely to become? c. What are the approximate pKin...
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...
3. Insoluble metal hydroxides can be used as a "buffer" to resist changes in pH. For example, consider the solution that would sul if 0.200 moles of MgCl2 are combined wih0.200 moles of NaOH in a total volume of 1.00 liter a) Determine the concentrations of all ionic species in this solution b) Calculate the pH of this solution c) You could add 0.040 moles of NaOH to the solution in part (a), causing additional Mg(OH)2 to precipitate. Calculate the...
D Question 4 5 pts 2b) There are 0.10 moles of N2O4 and 0.20 moles of NO 2 present in a 2.0 L container which may react according to: N2O4(g) = 2N028) Kp = 11 What is the value of Qp for the initial gas mixture? a. 4.0 b. 0.20 c. 0.40 d.5.0 . a. b. Consider the following equilibrium systems. Which direction will the reactions shift (reactants or products) when cooled? 200g + O2(g) = 2CO2(g) H2e+12(e)=2HI® H2(g) +126)...
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