Lead(ii) nitrate is added slowly to a solution that is 0.0800 m in ct ions. calculate the concentration of pb2+ ions (in mol/l) required to initiate the precipitation of pbcl2- (ksp for pbcl2 is 2.40 x 10-4.) type here to search

Answer : The concentration of ion is 0.0375 M.

Explanation :

The balanced equilibrium reaction will be:

The expression for solubility constant for this reaction will be,

Now put all the given values in this expression, we get:

Therefore, the concentration of ion is 0.0375 M.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.