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pH titration curves Lab Report. How does the use of a strong acid with a strong base and the use of weak acid with a strong base affect the pH titration curves?

Free essay example:

pH Titration Curves  

  1. Introduction

Research Question

How does the use of a strong acid with a strong base and the use of weak acid with a strong base affect the pH titration curves?

Hypothesis

The titration of strong acids and strong bases reaches the neutralization point faster than the titration of weak acids with strong bases.

Variables

Independent Variable

The use of different concentrations acidic solutions

Dependent Variable

The reach of the neutralization point between strong acids with strong bases and weak acids with strong bases.

Controlled Variables

  • pH probe

Lab quest pH probe will be used throughout the experiment. The use of different probes to collect the data needed can give different readings of the neutralization points. Thus, increase the percentage of error within the experiment.  

  • Burette

The same burette will be used when finding the neutralization points  for both parts of the experiment. Thus, this can decrease the percentage of error and accuracy of reading the results within the experiment.

  • Type of base solution

NaOH is a strong base solution. It will be used throughout the experiment for both parts. The use of different strong base solutions can result in different neutralization points. Hence, inaccurate results can be collected that would affect the pH titration curve.

  • pH indicator

Phenolphthalein is a universal pH indicator that is used for most titrations. Phenolphthalein will be used throughout the experiment.

  • volume of the unknown concentration of acidic solution

The volume of the unknown concentrations of acidic solutions will be the same (30 mL) throughout the experiment. This could give accurate readings for the pH titrations and help plot more accurate pH curves.

  • Beaker
  1. Methods

Materials & Apparatus

  • Two 100 mL Glass Beakers
  • Two disposable gloves
  • Lab Quest pH probe
  • Graduated cylinder (50 ml) ±0.5
  • Different acidic solutions; Ethanoic acid and Hydrochloric acid solutions
  • Different unknown concentrations of acidic solutions
  • NaOH solution
  • Burette
  • Volumetric flasks (100 mL)
  • Distilled H2O
  • Digital Scale (0.01)±0.005
  • Hot plate with Magnetic stirrer  

Procedure

The data collected throughout the experiment will be displayed in a data table. The experiment will be repeated three times, so the data table will represent results for both trials and the average. The data tables include the volume added of base solution to acidic solution each time (mL) for each trial of the experiment, the different neutralization points for each part of the experiment. The data collected will be displayed in a scatter graph to represent the different concentrations acidic solutions vs. the different neutralizations for each trial.

Part II

Titration of weak acid (Ethanoic Acid) with strong base (Sodium Hydroxide) using phenolphthalein indicator.

Trial 1

Trial 2

Trial 3

NaOH (ml)

pH

NaOH (ml)

pH

NaOH (ml)

pH

0

2.68

0

2.53

0

2.72

4

4.05

4

4.18

4

4.27

8

4.67

8

4.70

8

4.71

-

-

9

4.80

9

4.83

-

-

11

5.03

11

5.06

12

5.18

12

5.18

12

5.21

-

-

13

5.40

13

5.38

-

-

14

5.58

14

5.64

15

6.02

15

6.03

15

6.12

15.5

6.78

15.5

6.54

15.5

7.03

-

-

15.8

9.06

15.7

9.72

16

9.50

16

11.76

16

12.00

16.5

12.12

16.5

12.28

16.5

12.41

17

12.39

17

12.52

17

12.56

Thus, a bar graph can be implemented to analyze the data of the experiment throughout the three trials. Furthermore, another table can be added to conclude the overall average of the three trials. Thus, this would enhance the accuracy of the results obtained from the pH titration experiment.

Conclusion

The data collected throughout the experiment will be displayed in a data table. The experiment will be repeated three times, so the data table will represent results for both trials and the average. The data tables include the volume added of base solution to acidic solution each time (mL) for each trial of the experiment, the different neutralization points for each part of the experiment. The data collected will be displayed in a scatter graph to represent the different concentrations acidic solutions vs. the different neutralizations for each trial.

Thus, a bar graph can be implemented to analyze the data of the experiment throughout the three trials. Furthermore, another table can be added to conclude the overall average of the three trials. Thus, this would enhance the accuracy of the results obtained from the pH titration experiment. How does the use of a strong acid with a strong base and the use of weak acid with a strong base affect the pH titration curves? The titration of strong acids and strong bases reaches the neutralization point faster than the titration of weak acids with strong bases. The use of different concentrations acidic solutions. The reach of the neutralization point between strong acids with strong bases and weak acids with strong bases. pH probe: Lab quest pH probe will be used throughout the experiment. The use of different probes to collect the data needed can give different readings of the neutralization points. Thus, increase the percentage of error within the experiment.  Burette: The same burette will be used when finding the neutralization points  for both parts of the experiment. Thus, this can decrease the percentage of error and accuracy of reading the results within the experiment. Type of base solution: NaOH is a strong base solution. It will be used throughout the experiment for both parts. The use of different strong base solutions can result in different neutralization points. Hence, inaccurate results can be collected that would affect the pH titration curve.  pH indicator:  Phenolphthalein is a universal pH indicator that is used for most titrations. Phenolphthalein will be used throughout the experiment. volume of the unknown concentration of acidic solution: The volume of the unknown concentrations of acidic solutions will be the same (30 mL) throughout the experiment. This could give accurate readings for the pH titrations and help plot more accurate pH curves and the use of the Beaker of varying scale sizes such as 150 mL, 250 mL and 350 mL.

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