Methodical guidance for laboratory work №9

Experiment №1. Receiving of cupper glucerate

In 2 test-tubes pour 10-12 drops of 10% solution of NaOH and 3-4 drops solution of CuSO₄. Then in test-tube add 3-4 drops glucerine, in second test-tube add 3-4 drops of ethanol and mix it well. In first test-tube arise dissolving of precipitation with formation cupper glucerate:

2 NaOH + CuSO₄ ---> Cu(OH)₂ + Na₂SO₄

CH₂ – OH CH₂ – O\

| | Cu

CH – OH + Cu(OH)₂ --- > CH – O ∕ + 2H₂O

| |

CH₂ – OH CH₂ – OH

Experiment №2. Proof of acidity properties of phenols and receiving of sodium phenolutes and its properties.

In test-tube pour 5-6 drops of solution of phenol and add drop by drop of 10% solution of NaOH till dissolving it. Formatted sodium phenolutes, dissolving in

C₆H₅-OH + NaOH ---> C₆H₅-ONa + H₂O

To the reciting solution of sodium phenolutes add by drops 5% solution of СН₃СООН till formation muddy of free phenol.

С₆Н₅-ОNa + СН₃СООН ---> С₆Н₅-ОН + СН₃СООNa

6.Literature:

1. J. M. Sehgal. Modern Chemistry, class XI, Delhi, 1989 - 15 items.

2. Jean B. Umland & John M. Bellama, General Chemistry. Houston. USA. 1996 - 1 item.

3. Darrel D. Ebbing, General Chemistry, Wayne University, USA. 1990 - 3 items.

4. Karen C. Timberlake, Chemistry - An Introduction to General. Organic and Biochemistry, Los Angeles, USA, 1991-1 item.

7.Control:

1. Compare acidity of acetic acid and ethyl alcohol. Explain what substance and why possesses greater acidity.

2. Place of increases of acidity following compounds: n-methylalanine, aniline, n-nitroalanine. Give the explanation different acidity of compounds.

3. Place in row of decreases of acidity following compounds and explain the differences in acidity of the compounds:

а) 2-bromoethanol; ethanol; 2,2,2-trybromoethanol;

в) phenol; n-nitrophenol; n-aminophenol;

4.Palace following compounds in row of increases of acidity:

а) methylamine; dimethylamine; aniline;

в) ailine; n-aminophenol; n-amino benzoic acid.