If the titration of a 25 mL sample of calcium hydroxide requires 34.45 mL of a 0.100 M HCl, what is the molarity of the base.

1. Determine the conjugate acid-base pairs in each of the following reactions:

a) NH3(aq) + H2O(l) à NH4+(aq) + OH-(aq)

b) HNO2(aq) + H2O(l) à H3O+(aq) + NO2-(aq)

2. Classify the following substances as strong or weak electrolyte, strong or weak acid, strong or weak base, or salt:

a) H2CO3 b) HNO2 c) KOH d) PbI2

e) HI f) Mg(OH)2 g) H2SO4 h) H3PO3