In a reversed-phase column, a solute was found to have a retention time of 1.32 min, and an unretained species required 1.09 min when the mobile phase was 10% water and 90% ethanol. The polarity indices for water and ethanol are 10.2 and 4.4 respectively. Calculate the water-ethanol composition that should bring k to a value of 2.00. Show your work

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