The first method is through a pH strip. To estimate the pH of the sample, Tricia used a pH strip. Tricia collected 1 mL of the sample, which came out to have a pH of around 3.3. Furthermore, Tricia made a new setup in which 1 mL of the same sample was diluted with 9 mL of water, and the pH taken was now around 3.8. The second method is Titration, and Jillian used this method. Jillian prepared a 10 mL aliquot of the sample and diluted it with 25mL of distilled water. After this, Jillian added 2 drops of phenolphthalein, and it was titrated 3.54 mL of 0.048 mmol standardized NaOH to the endpoint. With this, answer the following questions. 1. Using the data in the titration method, compute the molarity of the acid. 2. Predict the pH of the sample, assuming that the titrated unknown is a strong acid. 3. Calculate the [H+] concentration in the sample before dilution using the values from the pH strip method.
Once upon a time, Tricia and her sister Jillian are doing titration to assess the molarity of the sample's total acid content. Using the pH measurements to report acidity, they were ordered to study a clear aqueous solution of an unknown monoprotic acid.
They decided to use two methods of experiments to gather essential data for their Chemistry Class.
The first method is through a pH strip. To estimate the pH of the sample, Tricia used a pH strip. Tricia collected 1 mL of the sample, which came out to have a pH of around 3.3. Furthermore, Tricia made a new setup in which 1 mL of the same sample was diluted with 9 mL of water, and the pH taken was now around 3.8.
The second method is Titration, and Jillian used this method. Jillian prepared a 10 mL aliquot of the sample and diluted it with 25mL of distilled water. After this, Jillian added 2 drops of phenolphthalein, and it was titrated 3.54 mL of 0.048 mmol standardized NaOH to the endpoint.
With this, answer the following questions.
1. Using the data in the titration method, compute the molarity of the acid.
2. Predict the pH of the sample, assuming that the titrated unknown is a strong acid.
3. Calculate the [H+] concentration in the sample before dilution using the values from the pH strip method.
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