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The equation that we normally use is , which n being the number of moles and v being the volume in liters. However, for this problem, with the way that I solved it, I had to manipulate the equation so that I could solve for the volume, which caused the equation to end up looking like: . Hope this helps!
You will want to use the equation M = n/v and manipulate it so that M initial = M final, so the equation would then look like n (initial) / v (initial) = n (final) / v (final). This will be helpful for the last step of part A of the problem when you are solving for the final volume after having calculated the initial molarity of Na+.
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