Built by Aabis
Notebook Theme

Experiment No. N

Analysis of Strontium Fluoride (Sr²⁺F⁻)

Aim

To determine the presence of anion and cation in the given salt

Preliminary Test

  • Odor: Odorless
  • Texture: Crystalline
  • Color: White
  • Solubility: Soluble in water

Test of Anion

ExperimentObservationInference
Salt + Conc H₂SO₄Colorless gas evolves that etches glassF⁻ may be present
Confirmatory Test
Calcium Chloride Test
Salt Solution + CaCl₂ solution		White gelatinous ppt formsPresence of F⁻ anion is confirmed

Test of Cation

ExperimentObservationInference
Salt + NaOH solutionNo reactionZero group cation is absent
Original salt + Dil. HClNo reactionFirst group cation is absent
Original salt + Dil. HCl + H₂S gas (Na₂S chips)No reactionSecond group cation is absent
Original salt + Dil. HCl + NH₄Cl solid + NH₄OH solutionNo reactionThird group cation is absent
Original solution + Dil. HCl + NH₄Cl + NH₄OH + (NH₄)₂CO₃White ppt is formedBa²⁺ may be present
Confirmatory Tests
Dissolve the white ppt in dil. acetic acid and add potassium chromateNo reactionBa²⁺ absent
Dissolve the white ppt in dil. acetic acid and add (NH₄)₂SO₄White pptSr²⁺ confirmed

Result

The given salt contains Sr²⁺ ions as cation and F⁻ ions as anion. The salt is Sr²⁺F⁻.

Precautions

  1. Handle the chemicals with care.
  2. Don't use excess of chemicals.
  3. Keep the mouth of the test tube away from the face.