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Question: i mainly or only need answers 4 and 5 thank...

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I MAINLY or only NEED ANSWERS 4 and 5 thank you,

buffer chosen: phosphate, pH before addition of base 7.21 after addition of base 8.87 (NaOH added)

0.5mL of 1M HCl

0.5mL of 1M NaOH

1) What is the ratio of A-/HA in your buffer after adding acid or base? 2) How many micromoles of A- & HA are present in the solution? 3) Calculate the theoretical pH of the buffer after adding .5mL of 1M HCl or 1M NaOH

4) calculate the % error between the theoretical pH and measured pH of the buffer after adding 0.5 mL of 1M HCl or 1M NaOH.

5) if you now add 5mL of 1M NaOH instead of 0.5ml of acid or base to your buffer, will you still have a valid buffer? explain. need to calculate final pH to support your answer

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