Practice: Calculate mass (grams) needed for the following base equivalent: 0.18 mEq of Mg(OH)_{2}.

**Acid-Base Equivalents** are used to measure the number of **H**^{+} ions or **OH**^{-} ions in acids and bases, respectively.

Concept #1: Understanding Acid-Base Equivalents

Concept #2: Calculating Acid-Base Equivalents

Example #1: Calculate number of Equivalents in each of the following:

a) 1 mole of H_{3}PO_{4} b) 2.7 g of RbOH

Concept #3: Equivalent Weight

Example #2: Calculate the equivalent weight of H_{2}SO_{4}.

Concept #4: Normality

Example #3: Calculate Normality of each of the following solutions:

a) 4.6 x 10^{-2 }M NaOH b) 0.35 g of H_{3}PO_{4 }in 1 L

Practice: Calculate mass (grams) needed for the following base equivalent: 0.18 mEq of Mg(OH)_{2}.

Practice: Identify the acid that possesses an equivalent weight of 63 grams.

Practice: Determine volume (mL) needed to prepare a 0.73 g of Ca(OH)_{2} solution with 1.25 N.