Determine the molar solubility for al(oh)3 in pure water. ksp for al(oh)3 = 1.3 x 10-33.

When Al(OH)₃ dissolves it dissociates as follows;
Al(OH)₃ ---> Al³⁺ + 3OH⁻
molar solubility is the number of moles that can be dissolved in 1 L of solution
if the molar solubility of Al(OH)₃ is x then molar solubility of Al³⁺ is x and OH⁻ is 3x
then solubility product constant - ksp formula is as follows 
ksp = [Al³⁺][OH⁻]³
ksp = (x)(3x)³
ksp = x * 9x³
ksp = 9x⁴
ksp = 1.3 x 10⁻³³ 
9x⁴ = 1.3 x 10⁻³³ 
x = 3.4 x 10⁻⁹ M
molar solubility of Al(OH)₃ is therefore 3.4 x 10⁻⁹ M

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant.