Homework Answers
Answer: False
End point pH range has to be kept in mind while chosing an indicator.
The indicator has to change its colour within this pH range
Phenolphthalein indicator is used in strong acid-strong base titrations. It changes it's colour in 8.3-10 pH range, which is approximately the pH range of end point in those strong acid- strong base titrations. In this way different indicators are used based on strength of acids and bases and end point pH ranges
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Phenolphthalein is a universal indicator and maybe used as an indicator for all acld-base titrations True...
Colours of phenolphthalein indicator 100 Alkaline End-point True False 1. The phenolphthalein indicator is not affected...
Colours of phenolphthalein indicator 100 Alkaline End-point True False 1. The phenolphthalein indicator is not affected by the pH of the solution. 2. The phenolphthalein Indicator changes colour close to the point of neutralisation which shows the end-point of the titration, 3. When adding acid to base the phenolphthalein indicator changes colour from colourless to pink at the end of the titration Titra Acids and alkalis
Define an acid-base indicator. Explain why phenolphthalein is chosen as an indicator for the titration for...
Define an acid-base indicator. Explain why phenolphthalein is chosen as an indicator for the titration for standardizing NaOH, determining % composition of KHP, and determining the acid content of vinegar. (Look up for the Ka for the indicator online and explain why this indicator is chosen for these titrations)
Methyl orange may be used as an indicator in acid-base titrations, it is described by the...
Methyl orange may be used as an indicator in acid-base titrations, it is described by the equilibrium HMOrng (red) = H+ + MOrng (yellow) pka = 3.98 At what pHs might we observe the following colors in this order?: red, orange, yellow a. O 1.00, 14.00, 7.00 b. O 7.00, 1.00, 4.00 c. O 2.00, 6.00, 4.00 d. O 2.00, 4.00. 6.00
24 Phenolphthalein is a commonly used indicator that is colorless in the acidic form (pH less tha...
Show all work and steps please
24 Phenolphthalein is a commonly used indicator that is colorless in the acidic form (pH less than 8 3) and pink in the base form (pH greater than 100) It is a weak acid with a pka of 8.7. What fraction is in the acid form when the ocid color is apparent? What fraction is in the base form when the base color is apparent?
24 Phenolphthalein is a commonly used indicator that is...
4. Phenolphthalein is an acid-base indicator. indicator (cite your source: textbook, webite, etc....
4. Phenolphthalein is an acid-base indicator. indicator (cite your source: textbook, webite, etc.) Describe the general properties of an acid-base 5. Consider the following reaction at equilbrium: Explain the effect of increasing the concentration of Ni gas on the concentration of the reactants and products when a new equilibrium is reached. Indicate which concentrations will be increased and which concentrations will be decreased when a new equilbrium is reached. Na: Increased or decreased 02: Increased or decreased NO: Increased or...
Which of the following is the acid-base combination that cannot use phenolphthalein as an acid-base indicator?...
Which of the following is the acid-base combination that cannot use phenolphthalein as an acid-base indicator? Select one: a. HBr and NH3 b. HF and KOH C. CH2COOH and NaOH d. HCI and LiOH
4. Why do you think only two drops of phenolphthalein are used in these titrations (HINT:...
4. Why do you think only two drops of phenolphthalein are used in these titrations (HINT: Phenolphthalein is a weak acid.)
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.
ELIMINARY EXERCISES: Experiment 16 Acid-Base Titrations- Define the following terms associated with titrations: a. standard solutions...
ELIMINARY EXERCISES: Experiment 16 Acid-Base Titrations- Define the following terms associated with titrations: a. standard solutions are base Soluchon When the molanty is alrea known. b. ondpoint is the pant at which color change occurs. C. indicator quie. Watersplutte dues that have one color in basic. 2. Write the balanced formula equation and the net ionic equation for the reaction of sodium hydroxide with hydrochloric acid. Formula equation: Net Ionic equation: 3. What is the molarity of a solution prepared...
Why is bromophenol blue rather than phenolphthalein used as an indicator for the antacid titration?
Why is bromophenol blue rather than phenolphthalein used as an indicator for the antacid titration?
Colours of phenolphthalein indicator 100 Alkaline End-point True False 1. The phenolphthalein indicator is not affected by the pH of the solution. 2. The phenolphthalein Indicator changes colour close to the point of neutralisation which shows the end-point of the titration, 3. When adding acid to base the phenolphthalein indicator changes colour from colourless to pink at the end of the titration Titra Acids and alkalis
Methyl orange may be used as an indicator in acid-base titrations, it is described by the equilibrium HMOrng (red) = H+ + MOrng (yellow) pka = 3.98 At what pHs might we observe the following colors in this order?: red, orange, yellow a. O 1.00, 14.00, 7.00 b. O 7.00, 1.00, 4.00 c. O 2.00, 6.00, 4.00 d. O 2.00, 4.00. 6.00
Show all work and steps please
24 Phenolphthalein is a commonly used indicator that is colorless in the acidic form (pH less than 8 3) and pink in the base form (pH greater than 100) It is a weak acid with a pka of 8.7. What fraction is in the acid form when the ocid color is apparent? What fraction is in the base form when the base color is apparent?
24 Phenolphthalein is a commonly used indicator that is...
4. Phenolphthalein is an acid-base indicator. indicator (cite your source: textbook, webite, etc.) Describe the general properties of an acid-base 5. Consider the following reaction at equilbrium: Explain the effect of increasing the concentration of Ni gas on the concentration of the reactants and products when a new equilibrium is reached. Indicate which concentrations will be increased and which concentrations will be decreased when a new equilbrium is reached. Na: Increased or decreased 02: Increased or decreased NO: Increased or...
Which of the following is the acid-base combination that cannot use phenolphthalein as an acid-base indicator? Select one: a. HBr and NH3 b. HF and KOH C. CH2COOH and NaOH d. HCI and LiOH
4. Why do you think only two drops of phenolphthalein are used in these titrations (HINT: Phenolphthalein is a weak acid.)
ELIMINARY EXERCISES: Experiment 16 Acid-Base Titrations- Define the following terms associated with titrations: a. standard solutions are base Soluchon When the molanty is alrea known. b. ondpoint is the pant at which color change occurs. C. indicator quie. Watersplutte dues that have one color in basic. 2. Write the balanced formula equation and the net ionic equation for the reaction of sodium hydroxide with hydrochloric acid. Formula equation: Net Ionic equation: 3. What is the molarity of a solution prepared...
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