Mixtures of 50gZnOTiO2 are each shaken with 250ml of water and allowed to settle. After 14 days of equilibration, it is found that the sediment volume is 1.65 times larger when the weight ratio of ZnO to TiO2 is 1.0 than when it is 100 . Some particle characteristics are the following (a) Assuming the particles are uniform spheres, calculate the ratio of the number of particles of ZnO to TiO2 for each of the weight ratios. (b) Propose an explanation for the more voluminous sediment that results when the weight ratio is 1.0 than when it is 100