Standardized NaOH solutions are typically restandardized if left unused for more than a week or two. The main concern is exposure to the atmosphere (thus it is important to seal the bottle well each time, and not leave it open during a lab period). Why is exposure to the atmosphere a concern (be specific)? 1. If a titration net volume should be 20.00 mL and a student accidentally goes one drop past this endpoint (~0.05 mL), what will the percent error in this titration be?
2. If the incorrect titration net volume described in question 3 is used to standardize an NaOH solution, will the calculated [NaOH] be higher or lower than the true value of that solution’s concentration? Explain briefly.