Tests for Ions

Part of the Food Chemistry and the Lab section of Coddy's Chemistry journey. Lesson 23 of 27.

A precipitate is an insoluble solid formed when two ions meet.

Cl⁻: silver nitrate, white AgCl. SO₄²⁻: barium chloride, white BaSO₄. CO₃²⁻: fizzes with acid (CO₂).

A beaker of barium chloride solution beside a beaker of a sulfate solution

Barium ions and sulfate ions form a white precipitate, BaSO₄

The precipitate's formula balances the charges: Ba²⁺ and SO₄²⁻ are 1 : 1.

Challenge

A few drops of barium chloride are added to a solution of a sulfate and a white precipitate forms. Combine barium ions and sulfate ions into the neutral precipitate.

Try it yourself

Ion combinerMake a neutral compound

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Food Chemistry and the Lab

1Carbohydrates

Sugars Glucose and Fructose Starch and Cellulose Recap - Sugar Detective

4Food Energy and Additives

Energy in Food Vitamins Preservatives and pH Recap - Food Label

7Practice Problems

Recap - Fat in Chips Recap - Vitamin C Titration

2Fats and Oils

Fatty Acids Saturated and Unsaturated Triglycerides and Esters Recap - Oil or Fat

5Laboratory Skills

Lab Safety Measuring Mass and Volume Making a Solution Separating Mixtures Recap - Lab Notebook

3Proteins

Amino Acids Peptide Bonds Denaturing Proteins Recap - Protein Builder

6Experiments

Titration in the LabTests for IonsRates in the Lab Recap - Mystery Powder