HZ is a weak acid. An aqueous solution of HZ is prepared by ...

[j.rubin]

HZ is a weak acid. An aqueous solution of HZ is prepared by dissolving 0.020 mol of HZ in sufficient water to yield 1.0 L of solution. The pH of the solution was 4.93 at 25.0 C. The Ka of HZ is ________.
 
  A) 1.2  10-5
  B) 6.9  10-9
  C) 1.4  10-10
  D) 9.9  10-2
  E) 2.8  10-12

Question 2

When lattice points occur at the center of each face, as well as each corner of a unit cell, the cell is called ________.
 
  Fill in the blank(s) with correct word

[AISCAMPING]

Answer to Question 1

B

Answer to Question 2

face-centered cubic