第十二章单元测试
  1. Which one should be added in batches when preparing NaH2PO4·2H2O?( )。

  2. A:Ca(H2PO4)2 B:NaOH C:Na2CO3 D:HCl
    答案:Na2CO3
  3. Which one cannot be used to determine the purity of products?( )

  4. A:acid-base titration B:pH meter C:Automatic potentiometric titrator D:Redox titration(氧化还原滴定法)
  5. Which of the following solutions are alkaline(碱性)?( )

  6. A:Na2HPO4•12H2O B:NaH2PO4•2H2O C:H3PO4 D:Na3PO4•12H2O
  7. The advantages of automatic potentiometric titrators are… ( )

  8. A:Wide applications B:High sensitivity C:High accuracy D:Available automation
  9. In this experiment, some ethanol(乙醇) is added to increase the solubility of the products. ( )

  10. A:错 B:对

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