Silver Mirror Reaction/Reaksi yang menghasilkan cermin perak

THE SILVER MIRROR REACTION/Reaksi yang menghasilkan cermin perak
(Tollen's Test/Tes Tollen)

Materials Needed/Bahan yang dibutuhkan

Solutions/Larutan-larutan:
Silver nitrate/Perak Nitrat, AgNO3 , 0.10 M (Dissolve 17 g AgNO3 in distilled water to make 1.0 L of solution./Larutkan 17 g AgNO3 dalam aquades untuk membuat 1.0 L larutan)
Potassium hydroxideKalium hidroksida, KOH, 0.80 M (Dissolve 22.4 g KOH in distilled water to make 500 mL of solution./larutkan 22.4 g KOH dalam aquades untuk membuat 500 mL larutan)
Dextrose/dekstrosa, C6H12O6 , 0.25 M (Dissolve 11.2 g dextrose in distilled water to make 250 mL of solution./larutkan 11.2 g dekstrosa dalam aquades untuk membuat 250 mL larutan)
Ammonia, NH3 , concentrated/pekat (15 M)
Nitric acid, HNO3 , concentrated/pekat (16 M)

Apparatus/alat-alat:
Glass container/wadah gelas: Florence or round bottom flask/labu dasar bulat, Erlenmeyer flask/labu erlenmeyer, bottle/botol, or other suitable container/wadah yang sesuai lainnya, one liter or smaller/ukuran 1 L atau lebih kecil. The container may be precleaned with nitric acid and rinsed with distilled water before the
experiment/wadah dapat dibersihkan terlebih dahulu menggunakan asam nitrat dan di bilas dengan aquades sebelum digunakan dalam percobaan.
Rubber stopper or cork to fit flask or bottle/tutup karet yang sesuai dengan labu
Beaker/gelas kimia, 150 or 250 mL
Graduated cylinders/gelas ukur, 10 mL, 25 mL and 50 mL
Medicine dropper/pipet tetes
Stirring rod/batang pengaduk

Procedure/Cara kerja

NOTE: This procedure is designed for a 125 mL flask/Cara kerja yang dimaksud hanya untuk ukuran labu dengan volume 125 mL.

Place 30 mL of silver nitrate solution in a 150-mL or 250-mL beaker/dimasukkan 30 mL larutan Perak Nitrat dalam gelas kimia 150/250 mL. Add concentrated (15 M) ammonia dropwise, with stirring, until the brown precipitate just dissolves/Ditambahkan amonia pekat sedikit demi sedikit sampai endapan coklat tepat larut. Add 15 mL of potassium hydroxide solution/kemudian ditambahkan 15 mL Kalium Hidroksida. If the brown precipitate reforms, add additional ammonia solution, dropwise, until it dissolves/jika endapan coklat terbentuk kembali, tambahkan larutan amonia sedikit-sedikit sampai larut.

Pour 3 mL of dextrose solution into the flask/dituangkan 3 mL larutan dekstrosa ke dalam labu. Add the contents of the beaker and stopper the flask/kemudian tutuplah labu tersebut. Shake the flask so that the liquid comes in contact with the entire inner surface of the flask/lakukan pengocokan pada labu agar terjadi kontak dengan seluruh bagian dalam labu. The silver film should begin to form within about 1 minute/lapisan perak seharusnya mulai terbentuk kurang lebih. Continue to shake until the flask has a silver mirror coating (this may take about 5 minutes).

Dispose of the solution and rinse the flask well with water (at least four complete rinsings).

After the flask has dried completely, it may be stoppered with a cork, rubber stopper, or appropriate cap.

The flask may be used as a Christmas tree ornament by attaching a wire tree hangar to the cork or stopper (a screw eyelet may be needed in the cork or stopper.) A drop of super glue placed at top of the flask, at the edge of the stopper, will help to hold the stopper in place.

The coating in the flask or bottle is permanent. Keep the flask or bottle stoppered to prevent oxidation. Do not add any liquids to the container as it will remove the silver from the glass.