A student prepares a standard solution using a stock solution of \(0.400\text{ M }\text{Cu(NO}_3\text{)}_2\text{(aq)}\). First, the student uses a volumetric pipet to transfer a \(10.0\text{ mL}\) aliquot of the stock solution into a \(100.0\text{ mL}\) volumetric flask and adds distilled water to the calibration mark, producing Solution 1. Next, the student transfers a \(25.0\text{ mL}\) sample of Solution 1 into a beaker and adds \(75.0\text{ mL}\) of distilled water, assuming volumes are additive. What is the molar concentration of nitrate ions, \([\text{NO}_3^-]\), in the final mixture?