The concentration of Cu2+ ions in the water (which also contains sulfate ions) discharged from a certain industrial plant is determined by adding excess sodium sulfide (Na2S) solution to 0.400 L of the water.
The molecular equation is
Na2S(aq) + CuSO4(aq) → Na2SO4(aq) + CuS(s)
Calculate the molar concentration of Cu2+ in the water sample if 0.0383 g of solid CuS is formed.
Enter your answer in scientific notation.