Module 5-6

Precipitation Reactions

Molarity

Acid-Base Reactions/Titrations

Oxidation Numbers

Redox Reactions

100

Characterize the following compounds as soluble or insoluble in water:
1.Ca₃(PO₄)₂

2.Mn(OH)₂

3.AgClO₃

4.K₂S

1. Insoluble

2. Insoluble

3. Soluble

4. Soluble

100

How many grams of KOH are present in 35.0 mL of 5.50 M solution?

10.8 g of KOH

100

Identify each of the following species as a Bronsted acid, base, or both:

PO₄^-3, ClO2^-, NH₄⁺, HCO₃^-

Base, Base, Acid, Both

100

What is the oxidation number of Cr in Cr₂O₇^2-?

100

Which element is oxidized and which is reduced?

2 Sr+O₂---> 2 SrO

Oxidized: Strontium

Reduced: Oxygen

200

Characterize the following compounds as soluble or insoluble in water:

1. CaCO₃

2. ZnSO₄

3. Hg(NO₃)₂

4. HgSO₄

5. NH₄ClO₄

1. Insoluble

2. Soluble

3. Soluble

4. Insoluble

5. Soluble

200

How many moles of NaNO₃ are needed to prepare 250 mLof a 0.707M MgCl₂ solution?

0.177 moles of NaNO₃

200

Complete the following equation:

CH₃COOH+KOH--->

CH₃COOH+KOH--->KCH₃COO+H₂O

200

Assign oxidation numbers to all the elements in the following compound:

PF₃

P:-3

F:-1

200

Which element is the oxidizing agent and reducing agent?

2 Li + H₂---> 2 LiH

Oxidizing agent: H₂

Reducing agent: Li

300

Write ionic & net ionic equations for the following reaction:

K₃PO₄_(aq)+ 3Sr(NO₃)_{2(aq) ---->}

Ionic: 6K⁺+2PO₄^-3+3Sr⁺²+6NO₃---> Sr₃(PO₄)_2(s)+6K⁺+6NO₃

Net Ionic: 3Sr⁺²_(aq)+2PO₄^-3_(aq)---->Sr₃(PO₄)_2(s)

300

What is the molarity of an 85.0 mL ethanol solution containing 1.77 g of ethanol (C₂H₅OH)?

0.452 M C₂H₅OH

300

Calculate the concentration, in molarity, of a NaOH solution if 25.0 mL of the solution are needed to neutralize 17.4 mL of a 0.312 M HCl solution.

0.217 M NaOH

300

What is the oxidation number for Mn in KMnO₄?

300

Classify the following redox reaction:

Cl₂+ 2KI---> 2KCl + I₂

Single displacement reaction

400

What are the spectator ions in the following reaction:

Na₂S_(aq)+ZnCl_2(aq)--->

2Na⁺ and 2Cl^-

400

What volume in mL of a 0.315 M NaOH solution contains 6.22 g of NaOH?

494 mL

400

How many milliliters of a 0.610 M NaOH solution are needed to neutralize 20.0 mL of a 0.245 M H₂SO₄ solution?

16.1 mL of NaOH

400

Give the oxidation numbers of:
C in CaC₂

O in ZnO₂^-2

W in WO₄^-2

C:-1

O:-2

W:+6

400

Write the half reaction for the following redox reaction:

4Fe+3O₂---> 2Fe₂O₃

Fe---> Fe³⁺ + 3e^-

O₂+4e^----> 2O^2-

500

Which of the following processes will likely result in a precipitation reaction? What will be the precipitate?

Mixing NaNO₃ solution with a CuSO₄ solution

Mixing BaCl₂ solution with a K₂SO₄ solution

Precipitate is BaSO₄

500

A chemist needs to add 3.81 g of glucose to a reaction mixture. Calculate the volume in mL of a 2.53 M glucose solution she should use for the addition.

8.36 mL

500

Define equivalence point

The point at which the acid has completely reacted with or been neutralized by the base.

500

Arrange the following species in order of increasing oxidation number of the sulfur atom:

H₂S, S₈, H₂SO₄, HS^-

H₂S,HS^-, S₈, H₂SO₄

500

Write the half-reactions and identify the oxidizing and reducing agents:

H₂+Cl₂--->2HCl

Oxidizing agent: Cl₂

Reducing agent: H₂

H₂---> 2H + 2e-

Cl₂+2e^---->2Cl^-