- It 141 Tr Sh Gu Is The Pit If Les Uf Se 420 11 17 Te Se Ne 1 Ni He Ne 1 15 1 11 Wi Te 1 Me Ut 1 2 9 11 The Del Re 15 1 (38.39 KiB) Viewed 138 times
expected results? Why?
2-For which acid-base combinations is the pH at the equivalent point neutral? Acidic?
Basic? Are these the expected results? Why?
3-A good indicator changes color in the vertical region of the titration curve.
Phenolphthalein changes from clear to red at a pH value of about 9. For which acid-
base combinations is pH=9 on the vertical region? For which acid-base combinations
does the time of the indicator color change and the time at the equivalence point
agree? Are these two lists the same?
- It 141 Tr Sh Gu Is The Pit If Les Uf Se 420 11 17 Te Se Ne 1 Ni He Ne 1 15 1 11 Wi Te 1 Me Ut 1 2 9 11 The Del Re 15 2 (32.99 KiB) Viewed 138 times
- It 141 Tr Sh Gu Is The Pit If Les Uf Se 420 11 17 Te Se Ne 1 Ni He Ne 1 15 1 11 Wi Te 1 Me Ut 1 2 9 11 The Del Re 15 3 (31.27 KiB) Viewed 138 times
DEL RE 151 ME RE HEL NE TE 4 IT TIE * EN 21 17 HT 1 13 NE 11 BT NE NE 11 OHHON WE TE M RESULTS: I VES OF STRONG AND WEAK ACIDS AND BASES
Table 1 - Equivalence Point and Indicator Color Change - Acid-Base Combination Initial pH Final pH Time of Indicator Color Change (sec) Time at Equivalence Point (sec) 88.5 80.5 pH at the Equivalence Point 7.5 87 HCl + NaOH HC2H302 + NaOHT HCI + NH OH WH HC2H302 + NH4OH 8.5 83 73 254 1663 3.72 1.3 2.10 1.77 611 119 53 دک 9