Suppose that you wish to titrate formic acid (CH3OH, a weak acid) with potassium hydroxide (a...
Suppose that you wish to titrate formic acid (CH3OH, a weak acid) with potassium hydroxide (a strong base). From the list below, which would be the best indicator to use for this titration?
|
Name of Indicator |
pH Range |
|
Methyl Yellow |
2.9 - 4.0 |
|
Methyl Orange |
2.5 - 4.4 |
|
Congo Red |
3.0 - 5.0 |
|
Phenolphthalein |
8.3 - 10.0 |
Homework Answers
Best indicator to use in titaration of weak acid with strong base is phenolphthalein because it changes colour in PH range between 8.3 - 10
For a weak acid and strong base you would expect solution of PH at equivalence point to be more then 7 (due to formation of basic salt) so you would pick an indicator that changes colour at more than 7.0 such as Phenolphthalein. in basic medium it turns colourless to pink in basic medium
Phenolphthalein self is a weak organic acid and it's unionised form is colourless. in basic medium it will be change into its anioni form (conjugate base) and turns the solution pink
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Suppose that you wish to titrate formic acid (CH3OH,
a weak acid) with potassium hydroxide (a...
QUESTION 1 6 points Save Answer The purpose of an indicator in an acid-base titration is...
QUESTION 1 6 points Save Answer The purpose of an indicator in an acid-base titration is to indicate the of the titration. Use Table 10.2 for the following question. If an acidic solution is titrated with a basic solution and methyl violet is used as an indicator, the solution color will change from to QUESTION 2 3 points Save Answer The molarity of a solution prepared by dissolving 17.0 g of hydrochloric acid (HCI (aq) in 133 mL of water...
19. Choose the most appropriate indicator for the titration of a weak base wit the expected...
19. Choose the most appropriate indicator for the titration of a weak base wit the expected equivalence point of the titration is at pH 6.0. a. methyl orange, pH range 3.2-4.4 b. methyl red, pH range 4.8-6.0 c. bromothymol blue, pH range 6.5-7.6 d. phenolphthalein, pH range 8.2-10.0 e. alizarin yellow R, pH range 10.1-12.0
Consider the titration of 25.00 mL of 0.115M NH3 (ka= 5.70e-10 ; kb= 1.75e-5) with 0.0920...
Consider the titration of 25.00 mL of 0.115M NH3 (ka= 5.70e-10 ;
kb= 1.75e-5) with 0.0920 M HCl.
a) calculate the pH of the solution for the following volume of
HCl: 6.25 mL
b) calculate the pH of the solution for the following volume of
HCl: 31.25 mL
c) calculate the pH of the solution for the following volume of
HCl: 50.0 mL
d) Which indicator from the table minimizes the titration error
and why?
blue Indicator thymol blue bromophenol...
Sodium carbonate, also called soda ash, is often analyzed by titration with strong acid. Initial concentrations...
Sodium carbonate, also called soda ash, is often analyzed by titration with strong acid. Initial concentrations of the carbonate ions are about 0.1 M. What indicator(s) would be suitable for detecting the stoichiometric point in this titration? (for H2CO3: pKa1 = 3.75 pKa2 = 10.33) Indicator Color at pH’s I. methyl orange 2.8 (red) - 3.5 (yellow) II. methyl red 4.4 (red) - 6.2 (yellow) III. phenol red 6.4 (yellow) - 8.0 (red) IV. thymol blue 8.0 (yellow) - 9.6...
Question 17 Sodium carbonate, also called soda ash, is often analyzed by titration with strong acid....
Question 17 Sodium carbonate, also called soda ash, is often analyzed by titration with strong acid. Initial concentrations of the carbonate ions are about 0.1 M. What indicator(s) would be suitable for detecting the stoichiometric point in this titration? (for H2CO3: pkai -3.75 PK 2 = 10.33) 1. II. III. IV. V. Indicator methyl orange methyl red phenol red thymol blue alizarin yellow R Color at pH'S 2.8 (red) - 3.5 (yellow) 4.4 (red) - 6.2 (yellow) 6.4 (yellow) -...
PLEASE EXPLAIN THE ANSWER Alizarin yel 16.16 If the pH is 8.0 at the equivalence point...
PLEASE EXPLAIN THE ANSWER
Alizarin yel 16.16 If the pH is 8.0 at the equivalence point for the titration of a certain weak acid with sodium hydroxide, what indicator might you use? (See Figure 15.10.) pH range for color change Indicator name H ii + + 0 Methyl violet yellow violet Thymol blue (acidic range) red yellow Bromphenol blue yellow blue Methyl orange red yellow Bromcresol green yellow blue Methyl red rad yellow • yellow blue Brumthymol blue Thymol blue...
Sodium carbonate, also called soda ash, is often analyzed by itration with strong acid. Initial concentrations...
Sodium carbonate, also called soda ash, is often analyzed by itration with strong acid. Initial concentrations of the carbonate ions are about 0.1 M. What indicator(s) would be suitable for detecting the stoichiometric point in this titration? (for H2CO: pka - 3.75 p.2 - 10.33) IL 11 TV V. Indicator methyl orange methyl red phenol red thymol blue allarin yellow R Color at he's 2.8 (red) - 3.5 (yellow) 4.4 (red) - 6.2 (yellow) 6.4 (yellow). 8.0 (red) 8.0 (yellow)...
4. Two 0.100 M solutions of the weak acids HA and HB are titrated using KOH...
4. Two 0.100 M solutions of the weak acids HA and HB are titrated using KOH at 25°C. The pH at equivalence of HA is 8.5, while the pH at equivalence of HB is 10.3. 1. Which of these two acids is weaker? ii. Which of the indicators below would be suitable in the titration of HA? Which would be suitable in the titration of HB? Indicator Alizarin yellow GR phenolphthalein methyl orange methyl red bromothymol blue pH range for...
Table 2: Indicator, pH Range, and Color Change Beaker Indicator Amount Needed for Reaction to Complete...
Table 2: Indicator, pH Range, and Color Change Beaker Indicator Amount Needed for Reaction to Complete pH Range pH at Color Change Color (Initial:Final) 1 Bromothymol Blue 6 6.0-7.5 6.6 Blue > Light Yellow 2 Turmeric Indicator 6 7.5-8.8 5.3 Light Red > Yellow 3 Methyl Orange 20 2.3-4.6 7.9 Orange > Pink Table 3: Titration Data Part 2: mL Citric Acid Added Part 2: pH Part 3: mL Citric Acid Added Part 3: pH Part 3: Color 0.0 10.5...
The following graph shows the pH curve for the titration of 25 mL of a 0.1 M monoprotic acid solution with a 0.1 M solut...
The following graph shows the pH curve for the titration of 25
mL of a 0.1 M monoprotic acid solution with a 0.1 M solution of a
monoprotic base.
#1's drop down menus both read weak/strong.
#2's drop down menu features a list of all the colors listed on the
graph.
0 5 10 15 20 25 30 35 40 45 50 mL of 0.1 M base added (1) The pH curve represents the titration of a __ acid with...
QUESTION 1 6 points Save Answer The purpose of an indicator in an acid-base titration is to indicate the of the titration. Use Table 10.2 for the following question. If an acidic solution is titrated with a basic solution and methyl violet is used as an indicator, the solution color will change from to QUESTION 2 3 points Save Answer The molarity of a solution prepared by dissolving 17.0 g of hydrochloric acid (HCI (aq) in 133 mL of water...
19. Choose the most appropriate indicator for the titration of a weak base wit the expected equivalence point of the titration is at pH 6.0. a. methyl orange, pH range 3.2-4.4 b. methyl red, pH range 4.8-6.0 c. bromothymol blue, pH range 6.5-7.6 d. phenolphthalein, pH range 8.2-10.0 e. alizarin yellow R, pH range 10.1-12.0
Consider the titration of 25.00 mL of 0.115M NH3 (ka= 5.70e-10 ;
kb= 1.75e-5) with 0.0920 M HCl.
a) calculate the pH of the solution for the following volume of
HCl: 6.25 mL
b) calculate the pH of the solution for the following volume of
HCl: 31.25 mL
c) calculate the pH of the solution for the following volume of
HCl: 50.0 mL
d) Which indicator from the table minimizes the titration error
and why?
blue Indicator thymol blue bromophenol...
Question 17 Sodium carbonate, also called soda ash, is often analyzed by titration with strong acid. Initial concentrations of the carbonate ions are about 0.1 M. What indicator(s) would be suitable for detecting the stoichiometric point in this titration? (for H2CO3: pkai -3.75 PK 2 = 10.33) 1. II. III. IV. V. Indicator methyl orange methyl red phenol red thymol blue alizarin yellow R Color at pH'S 2.8 (red) - 3.5 (yellow) 4.4 (red) - 6.2 (yellow) 6.4 (yellow) -...
PLEASE EXPLAIN THE ANSWER
Alizarin yel 16.16 If the pH is 8.0 at the equivalence point for the titration of a certain weak acid with sodium hydroxide, what indicator might you use? (See Figure 15.10.) pH range for color change Indicator name H ii + + 0 Methyl violet yellow violet Thymol blue (acidic range) red yellow Bromphenol blue yellow blue Methyl orange red yellow Bromcresol green yellow blue Methyl red rad yellow • yellow blue Brumthymol blue Thymol blue...
Sodium carbonate, also called soda ash, is often analyzed by itration with strong acid. Initial concentrations of the carbonate ions are about 0.1 M. What indicator(s) would be suitable for detecting the stoichiometric point in this titration? (for H2CO: pka - 3.75 p.2 - 10.33) IL 11 TV V. Indicator methyl orange methyl red phenol red thymol blue allarin yellow R Color at he's 2.8 (red) - 3.5 (yellow) 4.4 (red) - 6.2 (yellow) 6.4 (yellow). 8.0 (red) 8.0 (yellow)...
4. Two 0.100 M solutions of the weak acids HA and HB are titrated using KOH at 25°C. The pH at equivalence of HA is 8.5, while the pH at equivalence of HB is 10.3. 1. Which of these two acids is weaker? ii. Which of the indicators below would be suitable in the titration of HA? Which would be suitable in the titration of HB? Indicator Alizarin yellow GR phenolphthalein methyl orange methyl red bromothymol blue pH range for...
The following graph shows the pH curve for the titration of 25
mL of a 0.1 M monoprotic acid solution with a 0.1 M solution of a
monoprotic base.
#1's drop down menus both read weak/strong.
#2's drop down menu features a list of all the colors listed on the
graph.
0 5 10 15 20 25 30 35 40 45 50 mL of 0.1 M base added (1) The pH curve represents the titration of a __ acid with...
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