The densities of three solutions with known concentrations ( 20% , 50%, and 70%), and one unknown solution were determined. If the densities of 20%, 50% and 70% solutions are 0.69 and 0.58 and 0.49 g/mL, respectively, and the denisty of the unknown solution is 0.50 g/mL, what is the approximate concentration of the unknown solution? Hint: try to think of a range of two values between which the concentration of the unknown falls.

20 x (0.01/0.09)= 2.22

Is this the right set up? I'm not sure where to go next to solve the problem

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  1. I would put this on a piece of graph paper, plot % vs density. You can look at it and tell that it must be just about 70%.

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