owlet
  • owlet
A solution is prepared by mixing 50mL of 0.100 HCL and 10 mL of 0.200M NaCl. What is the molarity of chloride ion in this solution? I'm a slow learner so.. I need a step by step guide on how to do this please..
Chemistry
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SOLVED
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schrodinger
  • schrodinger
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owlet
  • owlet
@Rushwr
Rushwr
  • Rushwr
Do u know what molarity is ?
owlet
  • owlet
yes, isn't it equal to mol/L?

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Rushwr
  • Rushwr
Molarity = moles of solute / volume of the whole solution
Rushwr
  • Rushwr
yeah exactly !!!!
owlet
  • owlet
ok.. that is what I have to find out for Cl- what i did so far is do the chemical equation,which i'm not sure if right,, NaCl + HCl -> Na+ + H+ + Cl-
owlet
  • owlet
volume of the whole solution so should I add the 0.01 and 0.05?
Rushwr
  • Rushwr
We are asked to find the molarity of Cl^- ions right? For that we need to find the total moles of Cl^-1 ions. We get Cl^-1 ions from the solutions right? \[NaCl --------> Na ^{+ } + Cl ^{-1}\] \[HCl--------> H ^{+} + Cl ^{-}\] Yeah to find the total volume u have to add up 0.01 and 0.05
owlet
  • owlet
yes, right. total volume will be 0.06L..then what?
Rushwr
  • Rushwr
yeah now we have to find the total moles of Cl^- ions in both the solution
owlet
  • owlet
i need to use the value of the given molarities right? so will it be in NaCl: 0.200 x 0.01?
owlet
  • owlet
for HCl: 0.100 x 0.05?
Rushwr
  • Rushwr
yp
Rushwr
  • Rushwr
now u have to add up the moles from both solutions and put it on the molarity equation
owlet
  • owlet
okay... so total volume: 0.06 #of moles of Cl= (0.200 x 0.01) + (0.05 x 0.100) = 0.007 so 0.06/0.007 which is equal to 0.12 M?
Rushwr
  • Rushwr
moles divided by the volume not the other way round !!!!
owlet
  • owlet
oh yeah, i typed it wrong sorry lol I put 0.007/0.06 on my paper it's right i think :D the book says 0.117
Rushwr
  • Rushwr
yp yp that's the answer :)
owlet
  • owlet
thank you :)
Rushwr
  • Rushwr
no problem :)

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