Calculate the molarity of the acid using the titration data. b) If we assume that the titrated unknown is a strong acid, predict the pH of the sample.
In Experiment 4, we used titration to determine the total acid content of samples, which we reported in terms of molarity. Reporting acidity through pH measurements is quite different, in that we can only measure the amount of the acid in its ionized form. You were tasked to investigate a clear aqueous solution of an unknown
monoprotic acid. You decided to use two Chem 16.1 methods to gather data.
Method 1 – TITRATION: A 10. mL aliquot of the sample was diluted with 25 mL distilled water. Two drops of phenolphthalein were added and then it was titrated 3.54 mL of 0.048 M standardized NaOH to the endpoint.
Method 2 – pH STRIP: You took 1 mL of the sample and used a pH strip to estimate the pH, which turned out to be around 3.3. Another 1 mL of the sample was diluted with 9 mL of water. The pH was taken again and is now around 3.8
a) Calculate the molarity of the acid using the titration data.
b) If we assume that the titrated unknown is a strong acid, predict the pH of the sample.
c) Using pH strip results, calculate the [H+] concentration in the sample before the dilution.
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