Question

Data and Observations I. Determining the Unknown Acid Sample Size CvOt0ni aid identification code of unknown weak acid concentration of NaOH solution, M mass of weighing paper plus unknown acid, g mass of weighing paper, g final buret reading, mL initial buret reading, mL 2.0506M 2.0 Ill. Titrating the Unknown Acid identification code of unknown weak acid concentration of NaOH solution, M 500M determination 1 determination 2 LGS G mass of weighing paper plus unknown acid, g mass of weighing paper, g equivalence-point buret reading, mL initial buret reading, mL Calculations and Conclusions Show your calculations in the space provided. Include units on all quantities and round results to the correct number of I. Determining the Unknown Acid Sample Size significant figures 1. Calculate the mass of unknown acid required for titrating the acid sample to the equivalence point. determination 1 determination 2 2. Calculate the volume of NaOH solution required for titrating the acid sample to the equivalence point. determination 1 determination 2 3. From the mass of unknown acid and the volume of NaOH solution required to titrate it, calculate the mass of unknown acid requiring 25 mL of NaOH solution for titration. determination 1 determination 2 IlI.Titrating the Unknown Acid 4. Calculate the mass of unknown acid titrated to reach the equivalence point for each titration. determination 2 determination 1 5. Calculate the volume of NaOH solution required to reach the equivalence point for each titration. determination 2 determination 1 6. Use your titration curve to determine the titration mixture pH at the half-equivalence point and hence, the pKa of the unknown weak acid. Calculate the average pK, of the unknown weak acid. determination 1 determination 2 average pK 7. Use the equivalence-point volume and NaOH concentration to determine the number of moles of NaOH required to reach the equivalence point and hence, the number of equivalents of unknown acid titrated. determination 1 determination2 number of moles of NaOH required to reach the equivalence point, mol number of equivalents of unknown acid, equiv 8. Calculate the equivalent mass of the unknown acid for each determination and the average equivalent mass of the unknown acid. determination 1 determination 2 average equivalent mass of the unknown acid, g/equiv 9. Record the name, pK, and equivalent mass of the acid in Table 1 that best matches the pK, and equivalent mass that you obtained for your unknown. name of unknown acid pK, of unknown acid equivalent mass of unknown acid, g/equiv

Answer 1

si2e Mass e unkneun acid tatnau aud aidmass pare 2.33 q 6 pcint Final Busrette reading s 12.0ml 11:9 m
  
Mas ln kneun acid 211 eheminatuon 195-1.18 Volume-of-NaOH alence point 9e Determinaion 236 ml-o.om l