Qualitative Analysis in Pharmaceutical Inorganic Chemistry – Flame Tests and Cation/Anion Groups

Flashcards covering flame test colors, cation group classifications, and precipitating reagents from the provided notes on qualitative analysis.

What flame color is produced by Lithium in qualitative analysis?

Carmine Red

What flame color is produced by Strontium in qualitative analysis?

Crimson Red

What flame color is produced by Calcium in qualitative analysis?

Brick Red

What flame color is produced by Sodium in qualitative analysis?

Yellow

What flame color is produced by Potassium in qualitative analysis?

Violet

What flame color is produced by Magnesium in qualitative analysis?

White

What flame color is produced by Zinc in qualitative analysis?

White

Group 4 Cations (Insoluble Carbonates/Alkaline Earth Group) include which elements?

Calcium, Strontium, and Barium

Which precipitating reagent identifies Group 1 Cations (Chloride Insoluble Group) in qualitative analysis?

Hydrochloric acid (HCl)

Which precipitating reagent identifies Group 2 Cations (Acid Insoluble Group) in qualitative analysis?

Acidic H2S (acid solution of hydrogen sulfide)

Which precipitating reagent identifies Group 3 Cations (Base Insoluble Sulfide Group)?

Basic H2S (hydrogen sulfide in basic solution)

Which precipitating reagent identifies Group 4 Cations (Insoluble Carbonates, Alkaline Earth Group)?

Ammonium carbonate

Which precipitating reagent is used for Group 5 Cations (Soluble Group) in qualitative analysis?

No common precipitating reagent

What element is associated with a violet flame color in a flame test?

Potassium

Name an element that produces a brick red flame during flame tests.

Calcium

Name an element that produces a crimson red flame during flame tests.

Strontium

Name an element that produces a carmine red flame during flame tests.

Lithium

Which group do Calcium, Strontium, and Barium belong to in the cation analysis scheme shown in the notes?

Group 4 Cations (Insoluble Carbonates / Alkaline Earth Group)

What is the color of the Strontium flame when viewed through cobalt glass, based on the notes?

Crimson red (the base flame color remains red; cobalt glass can affect visibility of other colors but Sr’s red is prominent)