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Titration Labs

Titration Labs. Titrations. Our next two labs will be titrations labs. They will have exactly the same procedure as what we did for our standardization of NaOH activity in Advanced Lab Skills They will only differ in what chemicals we are analyzing.

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Titration Labs

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  1. Titration Labs

  2. Titrations • Our next two labs will be titrations labs. • They will have exactly the same procedure as what we did for our standardization of NaOH activity in Advanced Lab Skills • They will only differ in what chemicals we are analyzing. • In the first lab we will be analyzing unknown samples of two acids, HCl and CH3COOH (acetic acid). • In the second lab we will be analyzing a variety of fruit juices and sodas to see how much acid they contain.

  3. Purpose • The purpose of these experiments is very straightforward. • In the first experiment our goal will be to determine the concentration of two unknown acid solutions. • In the second experiment our goal will be to determine the amount of acid in the different drinks we analyze.

  4. Materials • We will be using the same materials we used to standardize our NaOH solutions. • The only material you should add to you list is “Standardized NaOHM.

  5. Safety • All acids and bases are corrosive to skin and eyes. • Goggles should be worn at all times. • Gloves should be worn at all times. • If you choose to you may wear an apron as well. • During our second lab, resist the temptation to drink any of the samples. • Even though they are commercially available beverages that you have probably had many times you NEVER eat or drink anything in the lab.

  6. Procedure • The procedure for this experiment will be identical to the procedure for the standardization of NaOH. • except our standardized NaOH is now our titrant (The chemical that goes in the reagent reservoir). • The first two things you should do are is calibrate your drop counter using water, and prep your samples. • We will be doing 2 trails for each unknown (unless a 3rd trial seems necessary. • Make sure you have a detailed procedure about how to calibrate the drop counter.

  7. Data • Your data table for these experiments should be very simple. • It should be set up so that you have room for data for 3 trials of both unknown acids. • You should have spots in your data table for: • The original volume of your unknown sample (I suggest 10mL like we have been doing) • The concentration of your titrant (standardized NaOH) • The equivalence point in mL • The pH at the equivalence point.

  8. Analysis Questions • Calculate the molar amounts of NaOH used in the reaction with each acid for each trial. • Calculate the molar concentration (molarity) of your acid solutions for each trial. Then calculate the average concentration for each acid (HCl and CH3COOH).

  9. Conclusion • Compare the actual molar concentrations of the two acids with your calculated average concentrations. Were your calculations within a reasonable range (about 5%) of the actual values? If not, suggest a few reasons for the inaccuracy.

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