A student dilutes 50 mL of a phosphoric acid-dihydrogenphosphate buffer solution to a final volume of 100 ml.
Will the pH of the buffer change noticeably? (Use Henderson-Hasselbeck conceptually )
For the same dilution above will the buffer capacity change?
Calculations: A 50.0 mL sample of a 0.100 M phosphoric acid,H3PO4 is titrated with 0.100 M NaOH.
Identify the major chemical species present and calculate the pHat these four points (first consider the titration curve)
Given : Ka (H3PO4)=7.5x10-3,Ka(H2PO4-)=6.2x10-8,Ka(HPO42-)=4.2x10-13
Point 1: after 20.0 mL of NaOH is added
Point 2: after 50.0 mL total of NaOH is added
Point 3: after 75.0 mL total of NaOH is added
Point 4: after 100.0 mL total of NaOH is added
