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A volume of 45.3mL of .719 M Ca(NO3)2 solution is mixed with 82.3mL of 1.409M Ca(NO3)2 solution calculate the concentration of the final solution

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moles soln 1 = M x L
moles soln 2 = M s L
Add moles together. Add L together. Final concn = moles/L. Substitute and solve.

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