Using the data collected for part b on your data sheet, calculate the molar mass of the unknown acid. Include the calculation for each trial and the average.
Trial One Results:
Mass unknown acid: 0.500g
Final buret reading: 18.01mL
Initial buret reading: 0.11mL
Volume NaOh used: 17.90mL
See your other post above.
To calculate the molar mass of the unknown acid, we need to use the volume of NaOH solution used, the concentration of the NaOH solution, and the stoichiometry of the acid-base reaction. Here's how you can get the answer:
1. Calculate the volume of NaOH solution used:
Volume used = Final buret reading - Initial buret reading
Volume used = 18.01 mL - 0.11 mL
Volume used = 17.90 mL
2. Calculate the number of moles of NaOH used:
Moles NaOH = Concentration NaOH * Volume NaOH used
Since we don't have the concentration of NaOH, we can't calculate this at the moment. Make sure you have the concentration data in order to proceed.
3. Use the stoichiometry of the acid-base reaction to determine the number of moles of acid reacted with the NaOH. Typically, the stoichiometry is 1:1 for a monoprotic acid (one acid molecule reacts with one base molecule).
4. Calculate the molar mass of the unknown acid:
Molar mass = Mass of the unknown acid / Moles of the unknown acid
Repeat steps 1-4 for the other trials if applicable.
To find the average molar mass, calculate the mean of the molar masses obtained from each trial by summing up the molar masses and dividing by the number of trials.
Finally, you'll have the molar mass of the unknown acid.