Give an example of two chemicals that could be mixed together to form a buffered system. Do not use any examples from the lab. Explain how why this system would be a good buffer.

In an experiment to determine the amount of aspirin in a tablet, one of the bottles of NaOH used was accidentally left open for 24 hours, which lead to it reacting with carbon dioxide. What will be the effect on the calculated amount of aspirin compared to the actual amount in the tablet and the concentration of the NaOH solution? Calculated amount increases since NaOH concentration will be lower than original. Calculated amount increases since NaOH concentration will be higher than original. Calculated amount decreases since NaOH concentration will be lower than original. Calculated amount decreases since NaOH concentration will be higher than original.

Order these chemical species by increasing pH of an 0.1 M aqueous solution of each. That is, imagine making an 0.1 M solution of each species. Select 1 next to the species that makes the solution with the lowest pH. Select 2 next to the species that makes the solution with the next higher pH, and so on. Notice that some of the rankings have been filled in for you already. Also notice that water is on the list. For that particular case, just compare the pH of pure water to the pH of the other solutions. Note for advanced students: for all charged species, you may assume the necessary counterions act as neither acids nor bases. species ОН HIO H₂O CH₂CICOO CH₂CICOOH CH₂O ΙΟ CH₂OH relative pH of 0.1 M aqueous solution 8 (highest) (Choose one) (Choose one) (Choose one) 1 (lowest) (Choose one) 7 2 X Ś

Order these chemical species by increasing pH of an 0.1 M aqueous solution of each. That is, imagine making an 0.1 M solution of each species. Select 1 next to the species that makes the solution with the lowest pH. Select 2 next to the species that makes the solution with the next higher pH, and so on. Notice that some of the rankings have been filled in for you already. Also notice that water is on the list. For that particular case, just compare the pH of pure water to the pH of the other solutions. Note for advanced students: for all charged species, you may assume the necessary counterions act as neither acids nor bases. species ОН IO C10₂ HCOOH HCIO₂ HIO HCOO relative pH of 0.1 M aqueous solution (Choose one) 7 (Choose one) 2 1 (lowest) (Choose one) (Choose one) X Ś olo 18 Ar