Final answer:
The dissolution reaction for nickel(II) sulfate in water is NiSO4(s) → Ni2+(aq) + SO42-(aq), indicating that it is soluble and dissociates into nickel and sulfate ions, increasing the solution's electrical conductivity.
Step-by-step explanation:
The student asked to write the dissolution reaction for nickel(II) sulfate in water. Nickel(II) sulfate is soluble in water. When it dissolves, it dissociates into its ions. The balanced chemical equation that represents this process is:
NiSO4(s) → Ni2+(aq) + SO42-(aq)
This equation shows that one mole of solid nickel(II) sulfate splits into one mole of nickel(II) cations and one mole of sulfate anions upon dissolution.
It's also useful to note that nickel(II) sulfate, like other soluble salts, can increase the electrical conductivity of the solution because the ions it releases are free to move and carry charge.