化合物HIn在水溶液中因存在以下电离平衡，故可用作酸碱指示剂
HIn(红色溶液) 
H＋(溶液)＋ In－(黄色溶液)
浓度为0.02 mol·L－1的下列各溶液： ①盐酸②石灰水③NaCl溶液 ④NaHSO4溶液 ⑤NaHCO3溶液 ⑥氨水，⑦AlCl3溶液其中能使指示剂显红色的是
答案：C
题目分析：向溶液中加盐酸、硫酸氢钠溶液、氯化铝（水解生成盐酸）溶液c(H+)都增大，平衡向左移动，指示剂显红色；向溶液中加石灰水、碳酸氢钠溶液（水解生成氢氧化钠）、氨水c(OH-)都增大，平衡向右移动，溶液显黄色；溶液中加入氯化钠溶液平衡不移动，溶液显橙色。
点评：硫酸氢钠在水溶液中相当于一元酸。
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| It was winter, and Mrs Hermann wanted to do a lot of shopping, so she waited 1 it was Saturday. When her husband 2 , she took him to the shops with her to pay(付款)for everything and to carry her bags. They went to a lot of shops, and Mrs Hermann 3 a lot of things. She often 4 and said, "Look, Joe! Isn't that beautiful?" He then answered,"All right, dear. How 5 is it?"And took his money 6 to pay for it. It was dark when they came out of the last 7 and Mr Hermann was very 8 and thinking about other things, like a nice drink at home. Suddenly his wife looked up at the sky and said,"Look 9 that beautiful moon, Joe! " 10 stopping, Mr Hermann answered,"All right. How much is it?" | ||||
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