vera_ewing
  • vera_ewing
If 5.25 mL of an unknown HCl sample was titrated with 25.3 mL of a 0.00100 M solution of NaOH to its equivalence point, what is the initial concentration of the acid? A. 4.64 × 10^-3 M B. 4.82 × 10^-3 M C. 8.28 × 10^-4 M D. 2.08 × 10^-2 M
Chemistry
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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vera_ewing
  • vera_ewing
@JoannaBlackwelder I think it's A or B.
JoannaBlackwelder
  • JoannaBlackwelder
What calcs did you use?
vera_ewing
  • vera_ewing
I couldn't figure out which ones to use, so I asked for help and someone said either A or B. I'm not sure what he did.

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JoannaBlackwelder
  • JoannaBlackwelder
Ok, can you write out the acid-base reaction?
vera_ewing
  • vera_ewing
Yeah I have it written down right now.
JoannaBlackwelder
  • JoannaBlackwelder
Ok, what did you get the molar ratios of the acid and base to be?
vera_ewing
  • vera_ewing
Oh wait it's B! Haha sorry :) thanks!
JoannaBlackwelder
  • JoannaBlackwelder
Yep, good job. :-)
Cuanchi
  • Cuanchi
I dont think it is B I got a different value @vera_ewing
vera_ewing
  • vera_ewing
It's B. I got it right :)
Cuanchi
  • Cuanchi
How come, I got D, how did you do?
JoannaBlackwelder
  • JoannaBlackwelder
Find the moles of the base, and since the reaction is equimolar in the acid and base, the acid needs the same number of moles. @Cuanchi
Cuanchi
  • Cuanchi
I was using the formula V1M1=V2M2 and I got D its something wrong if I use the formula @vera_ewing?
JoannaBlackwelder
  • JoannaBlackwelder
That is the same formula I used....not sure why we get different answers.

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