Use equation #color(blue)((1))# to get a value for #x# Use the molarities and volumes of the stock solutions to find a relationship between the number of moles of nitric acid each solution adds to the total. The total volume of the solution must be 4 L, so you know that Now, let's label the volume of the 1.4-M solution #x# and the volume of the 6.8-M solution #y#. The target solution must have a concentration of 4.0 M and a volume of 4 L ( #"1 dm"^3 = "1 L"#), so it must contain You know that molarity is defined as moles of solute, in your case nitric acid, divided by liters of solution. The idea behind this problem is that you need to use two equations, one that describes the number of moles needed for the target solution, and one that describes the total volume of the target solution.
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