Calculate the pH corresponding to each of the hy-
drogen ion concentrations given below, and indicate
whether each solution is acidic or basic.
a. [H+] = 5.21 x 10^-2 M
b. [H] = 6.99 X 10^-12 M
c. (H+) = 4.13 x 10-7 M
d. [H+] = 9.97 X 10-10M

Select the correct value for the indicated bond angle in each of the compounds. o−o−oo−o−o angle of o3 90° 109.5° < 109.5° 120° < 120° 180° f−b−ff−b−f angle of bf3 180° < 109.5° < 120° 120° 109.5° 90° f−o−ff−o−f angle of of2 < 120° 120° 90° 109.5° 180° < 109.5° cl−be−clcl−be−cl angle of becl2 90° 109.5° 180° 120° < 109.5° < 120° f−p−ff−p−f angle of pf3 90° 109.5° < 109.5° 180° 120° < 120° h−c−hh−c−h angle of ch4 90° < 109.5° 180° 120° < 120° 109.5°