Titration question

Question

Buret initial volume barium hydroxide: 45.37mL

Buret final volume barium hydroxide: 28.20mL

The concentration of Ba(OH)2: 1.4 M

The volume of HNO3: 25.0mL

The concentration of HNO3; ?

I have 2 questions

1: Why do I have an initial and final volume, and why is it necessary?

2: I could do the problem if I was given the volume of Ba(OH)2 but instead I was given the volume of HNO3. How do I find the Volume of Ba(OH)2 with the information given?

Answer 1

(1). The reason you have a final and initial volume is because that was the solution in the burette and it was added to the acid. In order to know the volume added, you would need to know the initial and final readings of the burette.

(2). You may not have been given the volume of Ba(OH)2, but you can find it from the initial and final burette readings. The volume of Ba(OH)2 used would be 45.37 ml - 28.20 ml = 17.17 mls.

Does that answer your question? Now you should be able to calculate the moles of HNO3 present, and the molarity of the HNO3.