Question

can i get some help with my post lab please. here is my data. i need help with questions 1-4 if its possible. thank you

1. Calculate the % error of pH for your buffer. The actual pH should have been 4.754 2. Analyze your data from Parts C and D. Evaluate and draw conclusions regarding your results. 3. Calculate the theoretical change in pH in your buffer (Part D) from the addition of HCl Compare this value to the observed change in pH. Did your buffer resist change in pH? 4. Calculate the theoretical number of mL of 0.200 M HCI needed to completely neutralize the weak base in the 25.0 mL of buffer. From your graph, determine how many mL of 0.200 M HCI were actually used to neutralize the base in the buffer. Compare this value to the calculated value. Did your buffer resist change in pH for the entire titration? Explain. Calculate how many moles of acid were added to reach the capacity of the buffer.

Answer 1

Question 1.

The percent error of pH for the buffer = {(Measured value - actual value)/actual pH}*100

The measured value of pH for the buffer = (4.36 + 4.43 + 4.64)/3 = 4.477

Therefore, the percent error of pH for the buffer = {(4.754 - 4.477)/4.477}*100 = 6.2%