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For salt, the water completely dissociates the Na and Cl ions because its polarity; the water surrounds all of the separated ions. A similar thing happens with NiCl but here the water actually bonds to the Ni to create a coordinate compound instead of just being electrostatically attracted like with the Na. Hope that helps!
To add on, unlike alkali metals like Na, transition metals like Ni are even smaller, highly charged cations and have many empty d-orbitals to accept electrons from groups of ions or molecules that are able to donate an electron pair(aka ligands) to form a coordinate compound.
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