Aqueous Solutions Introduction

Chapter 7 Introduction

by Lynda Leibowitz

​Please read through the informational slides and answer the questions that follow to refresh your memory of our introduction to chapter 7, reactions in aqueous solution.

Multiple Choice

NaCl (aq) means

• sodium chloride solid dissolved into water to create an aqueous solution

• sodium chloride solid, as in the table salt we use to salt our food

• sodium chloride liquid

Multiple Choice

Which of the following words does NOT mean that an ionic compound will come apart into its ions when placed into a beaker of water?

• dissociate

• ionize

• soluble

• spectator

Multiple Choice

Some ionic compounds will dissociate when placed into water. Which of the following compounds COULD NOT dissociate when placed into a beaker of water?

• $$CH_4$$  

• $$NaBr$$  

• $$CsF_2$$  

• $$Al\left(C_2H_3O_2\right)_3$$  

​The more ions a solution contains, the stronger the electrolyte:

​NaCl --> Na+ + Cl-

​NaCl in water will dissociate into 2 ions

​

​CaCl2 --> Ca+2 + 2Cl-

​CaCl2 will dissociate into 3 ions

​

​This means that calcium chloride will create the stronger electrolyte.

​

​When writing out the equation for ionization, be sure the charge is balanced on both sides of the equation,

Multiple Choice

Which solution contains an electrolyte?

• A

• B

Multiple Choice

When placed into water, $$Al\left(C_2H_3O_2\right)_3$$  will dissociate into how many ions?

• 1

• 2

• 3

• 4

Multiple Choice

Na₃PO_{4 (s)} is a soluble compound. When one mole of this compound dissociates in water, it forms -

• 1 mole of Na⁺ _(aq) and 1 mole of PO₄^3- _(aq)

• 3 moles of Na⁺ _(aq) and 1 mole of PO₄^3- _(aq)

• 1 mole of Na⁺ (aq), 1 mole of P^3-_(aq), and 4 moles of O^2- _(aq)

• 3 moles of Na⁺ (aq), 1 mole of P^3- _(aq), and 4 moles of O^2- _(aq)

Multiple Choice

Which of the following best describes a precipitate?

• an insoluble solid

• a soluble solid

• a soluble gas

• an insoluble liquid

Multiple Choice

AB (aq) + CD (aq) → AD (aq) + CB(s)

Which substance is the precipitate in the reaction above?

• AB

• CD

• AD

• CB

​Please take out your solubility rules to answer the next few questions.

Multiple Choice

According to the solubility rules (chart), compounds containing Ammonium cations, NH₄⁺ are:

• Not Soluble

• Sometimes Soluble

• Always Soluble

• Always insoluble

Multiple Choice

According to the solubility rules (reference chart), compounds containing Hydroxide anions, OH^-

• are insoluble when combined with ammonium

• are always insoluble

• are soluble when combined with group 1 elements

• are insoluble when they form compounds with Calcium

Multiple Choice

Use the Solubility Rules to determine if the following compound is soluble in water:

MgCl₂

• Soluble

• Insoluble

Multiple Choice

Use the Solubility Rules to determine if the following compound is soluble in water:

CaSO₄

• Soluble

• Insoluble

Multiple Choice

Use the Solubility Rules to determine if the following compound is soluble in water:

(NH₄)₂CO₃

• Soluble

• Insoluble

Multiple Choice

Use the Solubility Rules to determine if the following compound is soluble in water:

PbBr₂

• Soluble

• Insoluble

Multiple Choice

Use the Solubility Rules to determine if the following compound is soluble in water:

HCl

• Soluble

• Insoluble

Multiple Choice

CaCl₂(aq) + 2 AgNO₃(aq) → Ca(NO₃)₂(aq) + 2 AgCl(s)

Which product above is the precipitate?

• CaCl₂(aq)

• AgNO₃(aq)

• Ca(NO₃)₂(aq)

• AgCl(s)

Multiple Choice

Silver Iodide

• Soluble 
• Insoluble