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$8.$ Which substances, when in aqueous solution, can act as a buffer? Answer: yes or no

a$.HI$ and NaI fill in blank

b$.H{C}_2{H}_3{O}_2$ and $K{C}_2{H}_3{O}_2$ fill in blank

c$.H_{3}P{O}_4$ and $L{i}_{3}P{O}_4$ fill in blank

d$.HBr$ and NaBr fill in blank

e$.HF$ and $H_2$O