Why would the ph be acidic or basic at the equivalent point?

Ahypothrticalax type of ceramic material is known to have a density of 2.10 g/cm3 and a unit cell of cubic symmetry with a cell edge length of 0.57 nm. the atomic weights of the a and x elements are 28.5and 30.0 g/mol, respectively. on the basis of this information, which of the following crystal structures is (are) possible for this material: sodium chloride, cesium chloride, or zinc blende

In numbering carbon atoms in the parent chain of a hydrocarbon, why would you number from right to left, rather than left to right

Match the mixture with the substance// i really need on this guys (it’s a pic btw)