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【简答题】
欲用磷酸盐配制缓冲溶液 （磷酸的【图片】= 6.9´10-3，【图片】= 6.1´10-8，【图片】= 4.8´10-13），如选用Na2HPO4作为碱，可配制pH为 至8.21的缓冲溶液。（小数点后保留2位）
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A.
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