Uji Nyala Kalium

Mengidentifikasi kalium dari nyala api ungu lembayung

Flame Tests Beginner (Middle School) 20 menit ~$6,00

Tujuan

Amati warna nyala api ungu lembayung yang dihasilkan oleh ion kalium, dan pelajari cara menggunakan kaca biru kobalt untuk membedakannya dari kontaminasi natrium.

Latar Belakang

Potassium produces a pale lilac or violet flame when heated. The emission occurs at 766.5 nm and 769.9 nm (near-infrared/deep red doublet). Because the flame is quite faint and easily overwhelmed by sodium's intense yellow, cobalt blue glass is used as a filter to block sodium emission and reveal potassium's true color.

Peringatan Keselamatan

  • Wear safety goggles at all times
  • Keep hair tied back near open flames
  • Handle HCl with care

APD yang Diperlukan

goggles lab_coat

Bahan

  • Potassium chloride (KCl) (1 g)
  • Hydrochloric acid (HCl) (10 mL)
    1M concentration
  • Cobalt blue glass (1 piece)
    For filtering sodium light

Peralatan

Bunsen burner Nichrome wire loop Watch glass Forceps

Prosedur

1

Clean the nichrome wire thoroughly by dipping in HCl and heating.

2 menit
2

Place potassium chloride on the watch glass and collect a sample on the clean wire.

1 menit
3

Hold the sample in the Bunsen burner flame. Observe with the naked eye first.

2 menit
4

Now observe the flame through cobalt blue glass to filter out any sodium contamination.

2 menit
5

Record the difference in appearance with and without the cobalt blue glass filter.

2 menit

Hasil yang Diharapkan

Without the filter, you may see a faint lilac color possibly masked by yellow from sodium impurities. Through the cobalt blue glass, a clear violet/lilac flame should be visible as the glass absorbs the yellow sodium emission.

Pembersihan

Clean the wire loop with HCl. Return cobalt blue glass to storage.

Detail

Kategori
Flame Tests
Tingkat Kesulitan
Beginner (Middle School)
Durasi
20 menit
Perkiraan Biaya
$6,00
Langkah
5
Bahan
3

Eksperimen Lainnya

Laboratorium Perbandingan Uji Nyala 45 min Uji Nyala Barium 20 min Uji Nyala Kalsium 15 min Uji Nyala Litium 15 min Uji Nyala Natrium 15 min Uji Nyala Stronsium 15 min Uji Nyala Tembaga 15 min

Frequently Asked Questions

What is the objective of Uji Nyala Kalium?
Amati warna nyala api ungu lembayung yang dihasilkan oleh ion kalium, dan pelajari cara menggunakan kaca biru kobalt untuk membedakannya dari kontaminasi natrium.
How difficult is Uji Nyala Kalium?
This experiment is rated as Beginner (Middle School). It takes approximately 20 minutes to complete.
What safety precautions are needed for Uji Nyala Kalium?
Key safety precautions include: Wear safety goggles at all times; Keep hair tied back near open flames; Handle HCl with care.
What materials are needed for Uji Nyala Kalium?
The main materials required are: Potassium chloride (KCl), Hydrochloric acid (HCl), Cobalt blue glass.
What results should I expect from Uji Nyala Kalium?
Without the filter, you may see a faint lilac color possibly masked by yellow from sodium impurities. Through the cobalt blue glass, a clear violet/lilac flame should be visible as the glass absorbs the yellow sodium emission.