Question

Create a schematic diagram on how to prepare a Phosphate Buffer NaH2PO4 - K2HPO4 with a final volume of 500 ml, concentration of 0.10 M with a pH of 7.20 from 0.20 M NaH2PO4 and solid K2HPO4. Note: K = -6.3 x 10^8. Reminders: Show all calculations before preparing the schematic diagram. For solid K2HPO4, calculate the mass (based on 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 1.50 ml of 1.00 M HCl is added to the buffer solution? Is the buffer effective? Show your calculation.

          Create a schematic diagram on how to prepare a Phosphate Buffer
NaH2PO4 - K2HPO4 with a final volume of 500 ml, concentration of
0.10 M with a pH of 7.20 from 0.20 M NaH2PO4 and solid K2HPO4. Note:
K = -6.3 x 10^8. Reminders: Show all calculations before preparing the
schematic diagram. For solid K2HPO4, calculate the mass (based
on 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
1.50 ml of 1.00 M HCl is added to the buffer solution? Is the buffer
effective? Show your calculation.

Added by Rocio C.

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