问题 填空题

(10分)常温下有浓度均为0.5mol/L的四种溶液:①Na2CO3②NaHCO3③HCl ④NH3?H2O(1)上述溶液中,可发生水解的是         (填序号,下同)。

(2)上述溶液中,既能与氢氧化钠反应,又能和硫酸反应的溶液中离子浓度大到小的

顺序为                       

(3)向溶液④中加入少量氯化铵固体,此时c(NH4+)/c(OH)的值        (填增大、

减小、不变)。

(4)若将③和④的溶液混合后溶液恰好呈中性,则混合前③的体积     ④的体积(填

大于、小于、等于)。

(5)取10mL溶液③,加水稀释到500mL,则该溶液中由水电离出的c(H+)=        

答案

⑴①② ⑵ c(Na+)>c(HCO3-)>c(OH -)>c(H+)> c(CO32-) ⑶ 增大 ⑷ < ;⑸10-12mol/L

(1)强酸弱碱盐或强碱弱酸盐可发生水解,所以能水解的有:①Na2CO3②NaHCO3

(2)既能与氢氧化钠反应,又能和硫酸反应的溶液为②NaHCO3,其溶液中离子浓度大到小的顺序为:c(Na+)>c(HCO3-)>c(OH -)>c(H+)> c(CO32-);

(3)向溶液④中加入少量氯化铵固体,此时c(NH4+)/c(OH)的值将增大;

(4)若将③和④的溶液混合后溶液恰好呈中性,则混合前③的体积小于④的体积;

阅读理解



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A.PETER PANB.GONE WITH THE WIND
C.A LITTLE PRINCESSD.THE SECRET GARDEN
小题2: We can know from the passage that _________.
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A.abcB.acdC.bcdD.abd
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C.in a Chinese filmD.only to middle school students
单项选择题