Titration

Experiment 09 – Titration – Part 1

CHM 1045L – Fall 2020 – PBSC

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Pre-lab Setup

Type the procedure for this experiment in your own words, as though you were completing this experiment in the lab yourself. Feel free to use a bullet list (avoid huge paragraphs).

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Pre-lab Questions

1. What is the net ionic equation of a neutralization reaction?

 

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2. A student makes a standard solution of potassium hydroxide by adding 14.555 g to 500.0 mL of water. Answer the following questions, being sure to include units and remember sig figs. Include a picture of your work at the end of this worksheet.

a. What is the concentration of this standard solution?

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b. If the student pours out a 15.6 mL sample of this solution, how many moles of potassium hydroxide does the student have in the sample?

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3. What possible issues may result from air bubbles in the stopcock of the burette at the start of this experiment? Be specific about how this may affect the final calculated concentration of acid (Will it be lower or higher than actual? Why?).

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Calculations/Work

1. Add a picture of your work for pre-lab question #2 below. Be sure to include units!

 

Data

Table 1. Preparation of Sodium Hydroxide Solution. Fill out the table with your data.

 

 

Data

 

Mass NaOH (g)

 

 

 

Moles NaOH (mol)

 

 

 

Volume of NaOH solution, volumetric flask (mL)

 

 

 

Concentration NaOH solution (M)

 

 

 

Volume of NaOH for titration, Erlenmeyer flask (mL)

 

25.00 mL

 

Moles NaOH in Erlenmeyer flask (mol)

 

 

 

Table 2. Titration of River Samples from Site B with Sodium Hydroxide. Fill out the table with your data.

 

 

Rough Trial

 

1st accurate trial

 

2nd accurate trial

 

NaOH volume for titration (mL)

 

25.00 mL

 

25.00 mL

 

25.00 mL

 

Final burette reading (mL)

 

 

 

 

 

 

 

Initial burette reading (mL)

 

 

 

 

 

 

 

Volume added (mL)

 

 

 

 

 

 

 

Average volume added (mL)

 

 

 

 

 

 

Table 3. Titration of River Samples from Site C with Sodium Hydroxide. Fill out the table with your data.

 

 

Rough Trial

 

1st accurate trial

 

2nd accurate trial

 

NaOH volume for titration (mL)

 

25.00 mL

 

25.00 mL

 

25.00 mL

 

Final burette reading (mL)

 

 

 

 

 

 

 

Initial burette reading (mL)

 

 

 

 

 

 

 

Volume added (mL)

 

 

 

 

 

 

 

Average volume added (mL)

 

 

 

 

 

Post-lab Questions

1. What was the average calculated molarity of hydrochloric acid of each of the river samples? Be sure to include units and be aware of significant figures! Show all steps of your work at the end of the worksheet.

a. Concentration at site B:

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b. Concentration at site C:

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1. Answer the following questions from the titration simulation.

a. Hydrochloric acid ____________ when dissolved in water.

Choose an item.

b. When an acid and alkali react to form water and salt it is called ____________ reaction.

Choose an item.

c. An indicator helps us to see the _____________during a titration experiment by causing a color change.

Choose an item.

 

 

 

Calculations/Work

1. Add a picture of your handwritten work for post-lab question #1 below (do not just insert screenshots of the simulation’s calculations). Include calculations for the determination of molarity of hydrochloric acid for ONE of the sites. Be sure steps are labeled and all numbers have units. Also include your screenshot of the final confirmation page of the simulation.

 

 

 

2. Add a screenshot of your final confirmation page from the website (step 5 from the manual).