Which of these is NOT a good method for preparing a buffer?

Last updated: 8/9/2022

Which of these is NOT a good method for preparing a buffer? (HA is a weak acid.) Group of answer choices Equal volumes of 0.5 M HA and 0.5 M NaA Equal volumes of 1.0 M HA and 0.5 M NaOH Equal volumes of 0.5 M HCl and 0.5 M NaA Equal volumes of 0.5 M NH3 and 0.5 M NH4Cl