IB_Chemistry_Command_Terms.._Slides.pptx

command terms and their meaning

1. IBDP Chemistry – Command Terms & Lab Questions Topic: Standardization of NaOH using Oxalic Acid

2. Command Term: Calculate Example Question: Calculate the mass of oxalic acid dihydrate required to prepare 250 mL of a 0.1 mol L⁻¹ solution.

3. Command Term: Construct Example Question: Construct a flowchart that outlines the steps involved in preparing the oxalic acid solution and performing the titration.

4. Command Term: Define Example Question: Define the term “standard solution.”

5. Command Term: Describe Example Question: Describe the procedure followed to prepare the oxalic acid solution accurately.

6. Command Term: Determine Example Question: Determine the average volume of NaOH solution used to reach the endpoint in your titration trials.

7. Command Term: Discuss Example Question: Discuss the reliability of your results by referring to concordant values and potential errors.

8. Command Term: Distinguish Example Question: Distinguish between a primary standard and a secondary standard, using oxalic acid as an example.

9. Command Term: Draw Example Question: Draw a labeled diagram of the titration setup used in this experiment.

10. Command Term: Estimate Example Question: Estimate the percentage error in your titre values if your burette has an uncertainty of ±0.05 mL.

11. Command Term: Evaluate Example Question: Evaluate the accuracy and precision of your titration results and suggest two improvements.

12. Command Term: Explain Example Question: Explain why phenolphthalein was chosen as the indicator for this acid-base titration.

13. Command Term: Identify Example Question: Identify the endpoint of the titration by stating the color change observed with phenolphthalein.

14. Command Term: Label Example Question: Label the components of the titration apparatus in your diagram.

15. Command Term: Measure Example Question: Measure and record the volume of NaOH delivered in each titration trial.

16. Command Term: Outline Example Question: Outline the safety precautions necessary when handling oxalic acid and sodium hydroxide.

17. Command Term: Predict Example Question: Predict what would happen if impure oxalic acid was used to prepare the standard solution.

18. Command Term: Show Example Question: Show the steps in your calculation for determining the concentration of NaOH using the titration data.

19. Command Term: Sketch Example Question: Sketch a titration curve for a weak diprotic acid (oxalic acid) vs. strong base (NaOH), labeling the equivalence points.

20. Command Term: Solve Example Question: Solve for the number of moles of NaOH neutralized if the average titre was 24.8 mL of 0.1 M NaOH.

21. Command Term: State Example Question: State the molar concentration of the oxalic acid solution prepared.

22. Command Term: Suggest Example Question: Suggest a reason why your calculated molarity of NaOH might differ slightly from the labeled value.