Students were responsible for conducting 4 trials of titration of 15 mL samples of phosphoric acid (H3PO4) with volumes of a 2.2 molar strontium hydroxide (Sr(OH)2) solution. Determine the concentration of the phosphoric acid solution using the results that were obtained.

2H3PO4(aq) + 3Sr(OH)2(aq) Sr3(PO4)2(s) + 6H2O(l)



Trial 1

Trial 2

Trial 3

Trial 4

Initial Buret Reading (mL)

0.1

12.2

24.4

36.1

Final Buret Reading (mL)

12.2

24.4

36.1

48.3

Volume Base Added (mL)