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【单选题】
预配制 pH=4.75 的缓冲溶液 15mL ,需取浓度均为 0.1mol·L - 1 的 HAc ( pK a =4.756 )溶液和 NaOH 溶液各多少毫升混合A.
10mL HAc + 5mL NaOH
B.
12.5mL HAc + 2.5mL NaOH
C.
5mL HAc + 10mL NaOH
D.
2.5mL HAc + 12.5mLNaOH
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A.
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B.
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C.
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D.
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E.
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A.
He thinks it not dirty.
B.
He feels very bad.
C.
He is very tired.
D.
He has no time.
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A.
He'll go if the woman goes too.
B.
He doubts if he'll be able to go.
C.
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D.
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A.
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B.
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C.
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D.
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