The concentration of K₂SO₄ solution is 0.003 mol/L and the volume added is 5 mL (0.005 L).
\[
\text{Moles of K}_2\text{SO}_4 = \text{Concentration} \times \text{Volume} = 0.003 \, \text{mol/L} \times 0.005 \, \text{L} = 0.000015 \, \text{mol}
\]
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