Refer to the titration curve below. Choose the best match for each statement. So

ID: 1003977 • Letter: R

Question

Refer to the titration curve below. Choose the best match for each statement. Some answers will match more than one statement.

1) pH for a solution of a weak acid

2) pH for a buffer with equal concentrations of a weak acid and the salt of the weak acid

3) pH = pKa of a weak acid

4) pH for a solution of the sodium salt of the weak acid

5) equivalence point where moles of strong base added is just equivalent to the moles of weak acid in the orignal sample

6) pH for a solution of strong base and the salt of a weak acid

7) buffer pH range for the weak acid and its salt

8) buffer with an excess of the weak acid as compared to the salt of the weak acid

9) buffer range where the pH of the buffer is less than the pka of the weak acid

10) buffer pH range with an excess of the salt of the weak acid as compared to the weak acid

11) buffer range where the pH of he buffer is greater than the pka of the weak acid

no match

E through F

E through B

B through F

no match

E through F

E through B

B through F

titration curve 14.00 12.00 10.00 8.00 6.00 4.00 . 2.00 0.00 0.00 5.00 10.00 15.00 20.00 25.00 30.00 35.00 40.00 volume of titrant (ml)

1)A this is where pure weak acid is present.

2)C,B Beyond equivalence point we have buffer of weak acid and strong base with weak acid (conjugate base and acid)

3)B which is known as Half-equivalence point at this point pH=pKa

4)C, same as buffer with weak acid

5)no match

6)D,same as buffer with strong base

7) E to F

8)C

9)E to B

10)B to F

11)B to F

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