Question: help with this question ( thank you ) You can add acid to water. 4 If you want to prepare a buffer with a pH

help with this question ( thank you )

You can add acid to water. 4 If you want to prepare a buffer with a pH of 7.4, you can use HEPES ( pKa=7.48 ). 5 If we add 0.002mol of HAc to 0.004molNaAc and then bring up the volume to 200mL, what is the pH?(pKa=4.76)

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