Preparation of Buffers, pH Change, and Buffer Capacity: Given the data below, solve what is asked.

B. BUFFERS Table 7b-2. pH change. Parameters Distilled water pH before addition of NaOH pH after addition of NaOH pH before addition of HCI pH after addition of HCI 6.71 9.48 6.54 4.02 Samples 0.050 M phosphate buffer 6.65 6.71 6.30 6.25 0.0050 M phosphate buffer 6.48 6.57 6.35 6.21 Table 7b-3. Buffer capacity. Parameters Volume of phosphate buffer, mL Initial pH Final pH Final buret reading (Vt), ml Initial buret reading (V.), mL Samples 0.050 M phosphate buffer 0.0050 M phosphate buffer 35.0 35.0 6.31 6.52 7.31 7.52 42.10 42.80 35.00 42.10 pH Change 1. Calculate ApH by taking the difference of the final and initial pH. Buffer Capacity 1. Calculate ApH by taking the difference of the final and initial pH. 2. Calculate AVNaOH by taking the difference of Vi and Vi. 3. Calculate the moles NaOH using the molar concentration of NaOH and VNaOH. 4. Calculate buffer capacity (B) using Eqn 75-11. no. of moles of added acid or base B (ApH) (Volume of buffer in liters) (Eqn 7b-11) Unit of B: mol acid or base/L buffer (e.g. 0.2 mol NaOH/L phosphate buffer)