Formula of an Ionic Compound Pre-Lab

Many common drugstore chemicals are ionic compounds. Write the correct empirical formula for milk of magnesia (magnesium hydroxide).

• MgH₂

• MgO

• MgOH₂

• Mg(OH)₂

Many common drugstore chemicals are ionic compounds. Write the correct empirical formula for washing soda (sodium carbonate).

• NaH₂CO₃

• Na₂CO₃

• NaCO₃

• Na(CO₃)₂

Many common drugstore chemicals are ionic compounds. Write the correct empirical formula for epsom salt (magnesium sulfate).

• MgSO₄

• Mg₂(SO₄)₂

• MgS

• Mg₂S₂

Solutions of iron(III) chloride and sodium hydroxide were mixed in a series of precipitation reactions, as described in the experiment.

Identify two possible products in this precipitation (double replacement) reaction.

• Iron and sodium chloride

• Iron(III) hydroxide and sodium chloride

• Iron (II) hydroxide and sodium chloride

• iron hydroxide and sodium chloride

Solutions of iron(III) chloride and sodium hydroxide were mixed in a series of precipitation reactions, as described in the experiment.

Which product is likely to be insoluble in water and precipitate out as a red solid?

• iron (III) oxide

• sodium chloride

• iron(III) chloride

• sodium hydroxide

Solutions of iron(III) chloride and sodium hydroxide were mixed in a series of precipitation reactions, as described in the experiment.

Which volume ratio of reactants gave the most precipitate (see table 1).

• test tube 1

• test tube 2

• test tube 4

• test tube 7

Tags

NGSS.HS-PS1-5

Copper(II) chloride and sodium phosphate are...

• skin irritants

• eye irritants

• toxic by ingestion

• all of the above

Which safety equipment must be worn?

• chemical splash goggles

• apron

• chemical-resistant gloves

• all of the above

What type of chemical rxn are we doing in this lab?

• combustion

• double replacement (precipitation)

• single replacement

• synthesis