Sodium chloride crystals from cooking salt and sea salt DSCN1087

Greenhouse chemistry
Close-up movie clip of the crystals obtained from saturated solutions prepared from cooking salt and sea salt.
Questions
1 Give the chemical name of the compound commonly referred to as salt
2 Name the two types of salt used in these experiments
3 What shape are the crystals obtained from sea salt?
4 What is the anti-caking agent added to cooking salt?
5 Does the anti-caking agent appear to affect the shape crystals produced from cooking salt? Explain your answer.
6 Name two factors that affect how quickly solutions evaporate.
7 How could you alter the experimental conditions to produce larger crystals of sodium chloride from a saturated solution of sea salt
8 A common chemical reaction carried out at school is the neutralisation of an acid with a base. A base that is soluble in water is called an alkali.
The general equation is acid + base = salt + water
Name the acid and the alkali frequently used at school to produce sodium chloride in this way.
9 In everyday language when we use the word salt, we are usually referring to sodium chloride, as in this movie clip.
However, in chemistry the term salt has a much broader meaning, it is used as a general term for ionic compounds.
a Name another sodium salt
b Name another chloride salt
c Name a salt that is neither a sodium salt, nor a chloride salt
Answers
1 Sodium chloride
2 Cooking salt and sea salt
3 Cubic, cubes, cuboid, square shaped
4 Sodium ferrocyanide
5 Yes, the anti-caking agent does appear to affect the shape of the crystals produced. A mixture of irregularly shaped crystals appear to form, although there are some cubic crystals in the mixture. In general the solid particles are too small to discern a single, regular shape
6 Temperature, surface area of the solution and the humidity and movement of the surrounding air are four factors that affect the rate of evaporation. There are others.
7 Let the solution evaporate slowly at a cool temperature, in a narrow vessel with reduced surface area in still, not too dry surrounding air.
8 hydrochloric acid + sodium hydroxide = sodium chloride + water
9 Many answers are possible here, e.g.
a sodium iodide
b potassium chloride
c copper sulfate
Note UA-cam does not allow angled brackets in text descriptions