Homework Answers
The indicator is a substance that is added during a titration to identity the end point. The indicator will show colour change will be end point is reached.
The indicator will get dissociated as follows
HInd + H2O -------> H3O+ + Ind-
Thus, the initial molecule HInd must have one colour and the ion Ind- must have another colour to use it as an indicator.
Thus, option B. HInd and Ind-
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5 (1 Point) Consider the following equilibrium for an indicator: Hind + H2OH,0* + Indº Which...
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...
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
19 * (1 Point) Which of the following represents a buffer equilibrium? A. HI + H20...
19 * (1 Point) Which of the following represents a buffer equilibrium? A. HI + H20 H,0* + I C. HCN + HOe H,O + CNC E. NaOH OH- + Nat B. HCl + H2OH,0* + CH D. HCIO4 + H2OH,0* + CIO, A B ОС О О О OD Ο Ε
Question 9 1 pts Suppose you have an indicator that is diprotic and has pK 1...
Question 9 1 pts Suppose you have an indicator that is diprotic and has pK 1 - 3 and pK2 - 7. If Heln is yellow, Hin'is red, and In2-is blue what species is/are significantly present at pH of 7? what is the color of the indicator at a pH of 7? (Select Question 10 1 pts Indicators are commonly used during titrations to monitor the point at which an acid has fully been converted to its conjugate base for...
Question 6 4 pts Consider the reaction HC2H302(aq) + H2O(0) ---> H30"aq) + C2H302 (aq). Which...
Question 6 4 pts Consider the reaction HC2H302(aq) + H2O(0) ---> H30"aq) + C2H302 (aq). Which species is the conjugate acid? OC₂H₂O₂ ОН,0° 8 H₂O O two of these OHC2H302
QUESTION 1 Which of the following chemical species exhibits both ionic and covalent bonding? B205 0...
QUESTION 1 Which of the following chemical species exhibits both ionic and covalent bonding? B205 0 0 u B. 02- C2H5NO2 OP. 504² E. NH4C2H302 QUESTION 2 Match the electron configurations to the appropriate transition metal species. Some choices may be selected more than once. - Cu *[Kr]4d10552 RXej4f145d10 - Cult U - Ni2+ [Ar]4513010 [Kr]4d10 - Zn2+ E. [Ar]3d8 - . . Agt cd cd2+ * [Ar]3d10 - Aut QUESTION 3 Which of the following chemical species has non-polar...
asap Question 5 (1 point) For the following reaction at equilibrium, which choice gives a change...
asap
Question 5 (1 point) For the following reaction at equilibrium, which choice gives a change that will shift the position of equilibrium to favor products? CuO(s) + H2(g) H2O(g) + Cu(s); = -2.0 kJ/mol increase the temperature add some Cu(s) decrease the temperature remove some CuO(s) Question 6 (1 point) Determine the freezing point of a solution which contains 18 g of Na2SO4 in 175 g of water. Kf = -1.86°C/m 0-0.57°C 0-9.43°C O-4.04°C -1.35°C A student is taking...
1 hour QUESTION 3 1 POINT Which of the following species is oxidized during the following...
1 hour QUESTION 3 1 POINT Which of the following species is oxidized during the following reaction? CO2(g)+H2O() CH (g)O2(g) Select the correct answer below: O CH, O 02 OCO2 H,O FEEDBACK OOO
Question 8 (1 point) Which of the following sets is equal to {1,3}? o {2x +...
Question 8 (1 point) Which of the following sets is equal to {1,3}? o {2x + 1 € Z1-3 < x² < 3} {x² + 1 € Z|XE Z and x < 2} . o {x E N | 2x + 1 <2} o {x? EN|0 < 2x +1 < 3} O None of the above Question 7 (1 point) Let Α = {a, b, c} and consider the equivalence relation R = {(a, 1), (b, b), (c, c), (c,...
23) Consider the following generalized buffer solution equilibrium: BH+(aq) + H2O(1) H3O+(aq) + B(aq) 24) Select...
23) Consider the following generalized buffer solution equilibrium: BH+(aq) + H2O(1) H3O+(aq) + B(aq) 24) Select the ionic compound that is insoluble in water. A) Fe(NO3)3 B) MgS C) KBr D) NaCO3 E) NH_Br Consider the following generalized buffer solution equilibrium: BH+(aq) + H2O(1) H3O+(aq) + B(aq) When a small amount of a strong base such as sodium hydroxide is added to ti solution, which of the four species shown would experience an increase in concentration? (Hint: Use LeChatelier's principle.)...
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...
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
19 * (1 Point) Which of the following represents a buffer equilibrium? A. HI + H20 H,0* + I C. HCN + HOe H,O + CNC E. NaOH OH- + Nat B. HCl + H2OH,0* + CH D. HCIO4 + H2OH,0* + CIO, A B ОС О О О OD Ο Ε
Question 9 1 pts Suppose you have an indicator that is diprotic and has pK 1 - 3 and pK2 - 7. If Heln is yellow, Hin'is red, and In2-is blue what species is/are significantly present at pH of 7? what is the color of the indicator at a pH of 7? (Select Question 10 1 pts Indicators are commonly used during titrations to monitor the point at which an acid has fully been converted to its conjugate base for...
Question 6 4 pts Consider the reaction HC2H302(aq) + H2O(0) ---> H30"aq) + C2H302 (aq). Which species is the conjugate acid? OC₂H₂O₂ ОН,0° 8 H₂O O two of these OHC2H302
QUESTION 1 Which of the following chemical species exhibits both ionic and covalent bonding? B205 0 0 u B. 02- C2H5NO2 OP. 504² E. NH4C2H302 QUESTION 2 Match the electron configurations to the appropriate transition metal species. Some choices may be selected more than once. - Cu *[Kr]4d10552 RXej4f145d10 - Cult U - Ni2+ [Ar]4513010 [Kr]4d10 - Zn2+ E. [Ar]3d8 - . . Agt cd cd2+ * [Ar]3d10 - Aut QUESTION 3 Which of the following chemical species has non-polar...
asap
Question 5 (1 point) For the following reaction at equilibrium, which choice gives a change that will shift the position of equilibrium to favor products? CuO(s) + H2(g) H2O(g) + Cu(s); = -2.0 kJ/mol increase the temperature add some Cu(s) decrease the temperature remove some CuO(s) Question 6 (1 point) Determine the freezing point of a solution which contains 18 g of Na2SO4 in 175 g of water. Kf = -1.86°C/m 0-0.57°C 0-9.43°C O-4.04°C -1.35°C A student is taking...
1 hour QUESTION 3 1 POINT Which of the following species is oxidized during the following reaction? CO2(g)+H2O() CH (g)O2(g) Select the correct answer below: O CH, O 02 OCO2 H,O FEEDBACK OOO
Question 8 (1 point) Which of the following sets is equal to {1,3}? o {2x + 1 € Z1-3 < x² < 3} {x² + 1 € Z|XE Z and x < 2} . o {x E N | 2x + 1 <2} o {x? EN|0 < 2x +1 < 3} O None of the above Question 7 (1 point) Let Α = {a, b, c} and consider the equivalence relation R = {(a, 1), (b, b), (c, c), (c,...
23) Consider the following generalized buffer solution equilibrium: BH+(aq) + H2O(1) H3O+(aq) + B(aq) 24) Select the ionic compound that is insoluble in water. A) Fe(NO3)3 B) MgS C) KBr D) NaCO3 E) NH_Br Consider the following generalized buffer solution equilibrium: BH+(aq) + H2O(1) H3O+(aq) + B(aq) When a small amount of a strong base such as sodium hydroxide is added to ti solution, which of the four species shown would experience an increase in concentration? (Hint: Use LeChatelier's principle.)...
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