Bellwork

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# Bellwork - PowerPoint PPT Presentation

Outcomes May 2 and 3 I will be able to: 1. Determine whether statements about acids and bases are true or false. 2. Review problem solving and concepts from previous units 3. Identify conjugate acids and conjugate bases and successfully perform practice problems. Bellwork. Balance the equation:

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## Bellwork

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OutcomesMay 2 and 3I will be able to:1. Determine whether statements about acids and bases are true or false.2. Review problem solving and concepts from previous units3. Identify conjugate acids and conjugate bases and successfully perform practice problems

Bellwork
• Balance the equation:

KCl + Pb(NO3)2 KNO3 + PbCl2

2. The mole ratio of KCl to KNO3 is:

3. When would you use the mole ratio?

4. What type of reaction is this? (from question 1)

• Decomposition
• Double Replacement
• Combustion
• Single Replacement e. Synthesis
Practice Problems

How many milliliters of a 5.0 M H2SO4 stock solution would you need to prepare 100.0 mL of 0.25M H2SO4 ?

What is the molarity of a solution containing 56 grams of solute in 789 mL of solution? (molar mass of solute = 26 g/mol)

• a.1.7M b.2.7 M c. 2.8M d. 0.0027M
• 5 mL
• B
1. Identify the acid/conjugate base and base/conjugate acid pairs in the following reactions

HCN + H2O  H30+ + CN-

Acid BaseConjugate acid Conjugate base

HCl + H2O  H30+ + Cl-

Acid BaseConjugate acid Conjugate base

NH3 + H2O  NH4+ + OH-

Base Acid Conjugate acid Conjugate base

2. Identify the acid/conjugate base and base/conjugate acid pairs in the following reactions

HF + H2O  H30+ + F-

Acid BaseConjugate acid Conjugate base

H2CO3 + H2O  H30+ + HCO3-

Acid BaseConjugate acid Conjugate base

CH3NH2 + H2O  CH3NH3 + + OH-

Base Acid Conjugate acid Conjugate base

3. Categorize the following substances as either acids, bases, or neutral
• Milk, pH = 6.7
• Pure water, pH = 7.0
• Vinegar, pH = 3.0
• Soapy water, pH = 12
• Lemonade, pH = 2.2
• Coffee, pH = 5
• Eggs, pH = 8
• Blood, pH = 7.4
Arrhenius Acids and Bases

Acids dissociate (break apart) in water and form H3O+

Bases dissociate (break apart) in water and form OH-

Exit Quiz Preview:

Show how the following compounds will react with water. They are acting as Arrhenius acids and bases.

• HF + H2O  H3O+ + F-

(HF breaks up into H+ and F-)

2. KOH + H2O  K+ + OH- H2O

(KOH breaks up into K+ and OH-)

Which reactant (HF or KOH) is an acid? Which is the base? Explain your reasoning.