Two hypothetical salts dissolve according to the equations
AB(s) ⇌ A⁺(aq)+B⁻(aq)
A₂B₃(s) ⇌ 2A³⁺(aq)+3B²⁻(aq)
The two salts have identical Ksp values at 25 °C. Without performing numerical calculations, indicate which salt has the lower molar solubility in pure water. Provide the formula only.