Question

For nickel(II) carbonate, with what volume of water must a precipitate containing NiCO₃ be washed to dissolve 0.100 g of this compound? Assume that the wash water becomes saturated with NiCO₃ (Ksp = 1.36 × 10⁻⁷).

a) 73.5 mL
b) 147.0 mL
c) 36.8 mL
d) 18.4 mL

Answer 1

To determine the volume of water needed to dissolve nickel(II) carbonate (NiCO₃), we need to use the solubility product constant (Ksp) for NiCO₃. By calculating the number of moles of NiCO₃ and using its molar mass, we can determine the molarity and then calculate the volume of water required to dissolve the given mass.

Step-by-step explanation:

To determine the volume of water needed to dissolve 0.100 g of nickel(II) carbonate (NiCO₃), we need to use the solubility product constant (Ksp) for NiCO₃ which is 1.36 × 10⁻⁷.

First, we can calculate the number of moles of NiCO₃ using its molar mass. Then, using the molarity, we can calculate the volume of water needed to dissolve the compound.

Step 1: Calculate the moles of NiCO₃ using the given mass and molar mass.

Step 2: Use the moles of NiCO₃ to calculate its molarity.

Step 3: Use the molarity of NiCO₃ to calculate the volume of water needed to dissolve 0.100 g of the compound.