Question

To be completed in your lab notebook before the start of the lab period:

• Title of the experiment
• A short purpose. A brief summary of the procedure you will use; about one page will suffice. Do not copy the procedure verbatim from the packet! Using the hints from previous labs, prepare two Data Tables for this lab (one for aspirin, one for ascorbic acid). Each table should be neat and clear, with enough room allowed for the following: Brand of Tablet used Weights of all three tablets (include balance name and #) Molarity of the NaOH used Amount of phenolphtalein added Burer readings before and after each titration run
• Do the following exercise in your lab notebook:

Assuming that a particular ASA-containing tablet weighed 0.380 g and that it required 17.00 ml. of 0.1051 M NaOH to titrate to a phenolphthalein endpoint, calculate the mg of ASA in the tablet and the % of the tablet which is ASA. Show all calculations clearly!!

Answer 1

To calculate the mg of ASA in the tablet and the percentage of the tablet that is ASA, we use the given tablet weight, volume of NaOH used, and the molarity of NaOH. By applying the appropriate formulas and substituting the values, we find that the mg of ASA is approximately 320.84 mg, and the percentage of the tablet that is ASA is approximately 44859.46%.

In order to calculate the mg of ASA (acetylsalicylic acid) in the tablet and the percentage of the tablet that is ASA, we need to use the given information:

- Tablet weight: 0.380 g

- Volume of NaOH used: 17.00 mL

- Molarity of NaOH: 0.1051 M

To calculate the mg of ASA in the tablet, we can use the equation:

mg of ASA = (Volume of NaOH used) x (Molarity of NaOH) x (molar mass of ASA)

The molar mass of ASA is 180.16 g/mol. Substituting the given values, we have:

mg of ASA = (17.00 mL) x (0.1051 M) x (180.16 g/mol)

To calculate the percentage of the tablet that is ASA, we can use the equation:

% of ASA = (mg of ASA / Tablet weight) x 100

Substituting the calculated value of mg of ASA and the given tablet weight, we have:

% of ASA = [(17.00 mL) x (0.1051 M) x (180.16 g/mol) / 0.380 g] x 100

Now let's calculate the values:

mg of ASA = (17.00 mL) x (0.1051 M) x (180.16 g/mol) = 320.83592 mg

% of ASA = [(17.00 mL) x (0.1051 M) x (180.16 g/mol) / 0.380 g] x 100 = 44859.4579%

Therefore, the mg of ASA in the tablet is approximately 320.84 mg, and the percentage of the tablet that is ASA is approximately 44859.46%.