Calculate the molar solubility of baso4 in water, ksp=1.0*10^-10

When BaSO₄ dissolves in water it dissociates as follows;
BaSO₄ ---> Ba²⁺ + SO₄²⁻
molar solubility of compound is the amount of moles that can be dissolved in 1 L solution
if molar solubility of BaSO₄ is x then molar solubility of Ba²⁺ is x and SO₄²⁻ is x.
the formula for solubility product constant - ksp is as follows
ksp = [Ba²⁺][SO₄²⁻]
ksp = (x)(x)
ksp = x²
and ksp = 1 x 10⁻¹⁰
therefore 
x² = 1 x 10⁻¹⁰
x = 1 x 10⁻⁵ M
the molar solubility of BaSO₄ is 1 x 10⁻⁵ M

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).