Final answer:
The sign of the entropy change for the process NaCl (aq) (4.8M, 10°C) ⇌ NaCl (aq), (1.0M, 10°C) is likely to be negative as there is a decrease in concentration with no change in physical state.
Step-by-step explanation:
The sign of the entropy change can be predicted based on the change in concentration and the change in physical state of the substances involved in the process.
In this case, NaCl is going from a higher concentration (4.8M) to a lower concentration (1.0M), indicating a decrease in entropy.
However, since there is no change in physical state, the overall entropy change is likely to be small and the process can be considered as having a negative entropy change.