4. The Na transfer number in a NaCl solution, the concentration of which is 0.02 mol/L, was determined using the moving boundary method. Under the influence of a current of 1.6 * 10-3 A, in a tube with a cross section equal to 0.1115 cm2, the boundary moved 8 cm in 45 minutes. 15 sec. What is the required carry number?

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