A titration is performed using 25.00 mL of 0.10 M HCOOH (Ka = 1.8 x 10^-4) titra

Question

A titration is performed using 25.00 mL of 0.10 M HCOOH (Ka = 1.8 x 10^-4) titrated with 0.25 M KOH. Answer the following questions (#18, 19) about this titration.

18. (2 pts) What volume of base is needed to reach the equivalence point? You shouldn’t need to show work on this question!

The answer to this is 10 mL

19. (5 pts) Which of the following statements are true at the equivalence point in this titration? Circle all that apply.

a. moles of acid = moles of base

b. pH = 7

c. excess acid will determine the pH of solution

d. only salt and water are present in solution

e. pH is determined by hydrolysis of the basic salt

Explanation / Answer

Options a, b, d are right choices. Because of the following reasons.

1) This is a 1:1 reaction and therefore the no of moles of each will be equal to the other

2) The PH should be seven as the equimolecular mixture is neutral

3) As this is a neutralization reaction, the products are obviously the salt and water

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