Defining salts
Common "table" salt ( sodium chloride) is found dissolved in large quantities in seawater. Sodium Chloride is just one example of the many compounds which can be called salts. Most salts are crystalline ionic compounds
A salt is defined as :
A compound resulting from a chemical reaction of an acid, in which the acid's hydrogen ions are replaced by other (positive) ions .
Assumed background knowledge
Activity The best solution?
Different Ions have different solubilities . When two soluble ions are combined to form a salt the salt will remain in solution. Thus a soluble salt is formed
When two insoluble ions mix to form a salt, the salt forms as a precipitate.
Activity. Pretty precipitation
The video the first reaction shows nitrate reacting with potassium iodide solution - the result is a yellow precipitate of lead iodide. We can write the following equation:
Activity. Predicting precipitates
Use the solubility table to predict what you would observe when you mix the following pairs of solutions:
Activity. Neutralisation
2.37 - 2.39 Activity 5. Reacting Acids
2.39, 2.40, 2.42 Activity 6. Making Soluble Salts
Study the video and use it to construct a sequence of instructions to describe how to make a soluble salt :
Activity. Making Insoluble Salts
Watch the video then complete the missing word exercise below.