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Do u know what molarity is ?

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

Molarity = moles of solute / volume of the whole solution

yeah exactly !!!!

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

yes, right.
total volume will be 0.06L..then what?

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

i need to use the value of the given molarities right?
so will it be in NaCl: 0.200 x 0.01?

for HCl: 0.100 x 0.05?

yp

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

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

yp yp that's the answer :)

thank you :)

no problem :)