常温下,在CH3COOH与CH3COONa的混合溶液中,若它们的浓度均为0.10mo1.L-1, 测得pH是4. 75,现将此溶液与等体积的水混合后,溶液...

作者: tihaiku 人气: - 评论: 0
问题 常温下,在CH3COOH与CH3COONa的混合溶液中,若它们的浓度均为0.10mo1.L-1, 测得pH是4. 75,现将此溶液与等体积的水混合后,溶液的pH值是:
选项 A. 2. 38 B. 5. 06 C. 4. 75 D. 5. 25
答案 C
解析 解 醋酸和醋酸钠组成缓冲溶液,醋酸和醋酸钠的浓度相等,与等体积水稀释后,醋酸和醋酸钠的浓度仍然相等。缓冲溶液的pH=pKa ,溶液稀释pH不变。

相关内容:常温,CH3COOH,CH3COONa,混合,溶液,浓度,0.10mo1.L-1,体积

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