Difference between solute potential and solute concentration?

Inverse relationship, if I remember correctly.

High [solute] = low solute potential.

Why would that be the case? I always thought high solute concentration =high solute potential... Thanks

It doesn't relate to to the potential of solutes to dissociate from the solution. Rather, solute potential is one of the factors in determining water potential.

Ψ = Ψs + Ψp

Ψs is the solute/osmotic potential (interchangeable terms).

Generally, Ψs indicates the potential of water to move from a hypotonic to hypertonic solution.

Ψs of pure water is considered 0. Adding solutes to a solution results in an increasing solute concentration, and a decreasing solute potential, as water is less likely to leave the system when separated from pure water by a semi-permeable membrane.

Going a bit further into chemical equations to provide a bit more background:
Ψs = -iMRT
M = molarity of solute
i = van 't Hoff factor (determined by dissociation of solute)
R = ideal gas constant
T = temperature

i for glucose is 1 (as there is no dissocation)
i for NaCl is 2 (Na and Cl separate completely in water)
i for CaCl2 is 3 (Ca and Cl separate completely, resulting in 3 particles in the solution)

Overall, increasing the number of solutes results in an increasingly negative solute potential.

I was given this question: Describe and explain the effects of placing animal and plant cells in solutions of differing solute concentration . I don't get this because the question asks about solute concentration but in the markscheme, it only mentions solute potential. How can you relate them then?

Also, when the water leaves the cell into the external solution, can you only say that the solution is hypotonic to the cell? Because that's why they described it in the textbook.. thanks