Question

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..

Answer 1

@Rushwr

Answer 2

Do u know what molarity is ?

Answer 3

yes, isn't it equal to mol/L?

Answer 4

Molarity = moles of solute / volume of the whole solution

Answer 5

yeah exactly !!!!

Answer 6

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-

Answer 7

volume of the whole solution so should I add the 0.01 and 0.05?

Answer 8

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

Answer 9

yes, right.

total volume will be 0.06L..then what?

Answer 10

yeah now we have to find the total moles of Cl^- ions in both the solution

Answer 11

i need to use the value of the given molarities right?

so will it be in NaCl: 0.200 x 0.01?

Answer 12

for HCl: 0.100 x 0.05?

Answer 13

yp

Answer 14

now u have to add up the moles from both solutions and put it on the molarity equation

Answer 15

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?

Answer 16

moles divided by the volume not the other way round !!!!

Answer 17

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

Answer 18

yp yp that's the answer :)

Answer 19

thank you :)

Answer 20

no problem :)