Titration Lab Sheet Day 2 Alt. Need help

Question

helpneeded1914 · Answer

attachment

welshfella · Answer

the blanced equation for titration 2 is

NaOH + HBr --->   NaBr + H2O

welshfella · Answer

So the molar ratio is 1:1

helpneeded1914 · Answer

Do you know the concentration of the Acid for the second one? @wellshfella

welshfella · Answer

i have to go now   be back in 15 minutes

helpneeded1914 · Answer

Okay no problem

welshfella · Answer

Back now

2 moles of KOH react with 1 mole of H2SO4
25 mls 0.15 M KOH will reactr with 12.5 mls of 0.15 H2SO4

so concentration of H2SO4 = (12.5 / 15) * 0.150

welshfella · Answer

what do you get?

welshfella · Answer

gram your calculator and work it out

helpneeded1914 · Answer

0.125?

helpneeded1914 · Answer

Wait. That's for Titration #1, I meant for # 2

helpneeded1914 · Answer

Can you help me with that one?

welshfella · Answer

oh right

welshfella · Answer

Hold on  the volumes in the table are different form the ones in the question.  Which are correct?

helpneeded1914 · Answer

Oh right, well you see they are the same measurements but jus with a different unit. Instead of being ML they are L. But the teacher said to change the ml to L so thats what I did.

helpneeded1914 · Answer

They are the same amount. Use the ones on the table.

welshfella · Answer

yes but they are still different.
I guess the ones in question are correct?

helpneeded1914 · Answer

Well yea they are different. Whichever one you prefer I guess. As long as we get the same answer out of both

welshfella · Answer

in Q  NaOH = 0.02l
in T   Na OH = 0.03L

welshfella · Answer

Ok so we'll take the ones in the question 
0.02L  of 0.250 M NaOH will neutralise 0.02L of 0.250 M HBr      ( because 

molar ratio = 1:1)
but the volume of acid = 0.03L

which means that the HBr is weaker so 
concentration of the acid is 2/3 * 0.250

helpneeded1914 · Answer

0.17 (rounded to the nearest hundredth)

welshfella · Answer

yes

helpneeded1914 · Answer

So the concentration of the acid would be 0.17 M?

welshfella · Answer

to be honest I'm confused by the question and table being different but thats the answer if our assumptions are correct.

helpneeded1914 · Answer

Well the teacher helped us out in the first one but since I had to leave class early I didnt get to see the whole thing. And she used the L format to find the concentration.

welshfella · Answer

OH - its the concentration of the base they want in the question!!

welshfella · Answer

im getting a headache! lol but i have to go..

helpneeded1914 · Answer

Lol i am too. Im as lost as i can get. Idk, i think ill jus leave it as blank.