Question

Create a schematic diagram on how to prepare a Phosphate Buffer NaH2PO4 - K2HPO4 with a final volume of 500. mL, concentration of 0.10M with a pH of 7.20 from 0.20 M NaH2PO4 and solid K2HPO4. Note: Ka = 6.3 x 10-8 Reminders: Show all calculations before preparing the schematic diagram. For solid K2HPO4, calculate for the mass (based from calculated moles of salt) rather than the volume since this is a solid substance. Calculations (20 pts): Schematic Diagram (20 pts): Additional Question (10 pts): What is the change in pH if 1.50mL of 1.00M HCl is added to the buffer solution? Is the buffer effective? Show your calculation.

Answer 1

Answer:

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