Unit 13 Marker Board Review
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Transcript of Unit 13 Marker Board Review
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Unit 13 Marker Board ReviewAcids & Bases
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Question #1
List 4 properties of acids.
Answer:1 – Sour taste2 – React with metals to form hydrogen gas3 – React with metal carbonates to form CO2 gas4 – Turn indicators red
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Question #2
List 4 properties of bases.
Answer:1 – Taste bitter2 – Unreactive with metals and carbonates3 – Feel slippery4 – Turn indicator blue
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Question #3
According to Arrhenius, acids must contain _______ ions & bases must contain _______ ions.
Answer:hydrogenhydroxide
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Question #4
A Bronsted acid _____________ a _______________ and a base ______________ a ____________.
Answer:- donates- hydrogen ion- accepts- hydrogen ion
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Question #5Label the Acid, Base, Conj Acid, Conj Base
• NH3 + H2O NH4+ + OH-
• H2CO3 + H2O H3O+ + HCO3-
Answer:NH3 + H2O NH4
+ + OH-
B A CA CB
H2CO3 + H2O H3O+ + HCO3-
A B CA CB
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Question #6 (Acc Only)
Base anhydrides contain a _________________ and oxygen.
Acid anhydrides contain a _________________ and oxygen.
Answer: Metal
Nonmetal
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Question #7
When an acid reacts with a base to neutralize it, the products are a _______________ & ___________.
Answer: Salt & Water
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Question #8
Pure water has a pH of _________ because …
Answer: 7…Because it is neutral!
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Question #9
Acids have a pH ___________ than 7; bases _____________ than 7.
Answer: Less
Greater
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Question #10
• HBr• NaOH• HNO2
• HCN• NH3
• H2SO4
• Mg(OH)2
• H2CO3
• HC2H3O2
Write the name for the following formulas. Is it an acid or base?Check your answers after you’ve written ALL of them!
Hydrobromic Acid—acid
Sodium Hydroxide—base
Nitrous Acid—acid
Hydrocyanic Acid - acid
Ammonia—base
Sulfuric Acid—acid
Magnesium Hydroxide - base
Carbonic Acid—acid
Acetic Acid—acid
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Question #11
Write & balance the equation for the neutralization of sulfuric acid with potassium hydroxide.
Answer: H2SO4 + 2 KOH 2 H2O + K2SO4
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Question #12
Write & balance the neutralization reaction of hydrobromic acid & calcium hydroxide.
Answer:
2 HBr + Ca(OH)2 2 H2O + CaBr2
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Question #13
The formula for the hydronium ion is ____________________ & for the hydroxide ion _______________.
Answer: H30+ & OH-
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Question #14
An H+ ion is really just a _______________ and cannot exist in solution.
Answer: Proton
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Question #15
Write the equation for the self-ionization of water.
Answer: H2O + H2O OH- + H3O+
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Question #16
The formula for calculating [H3O+] from pH is ______________________. I type this into my calculator as: _________
Answer: [H3O+] = 10^(-pH)
2nd log (negative pH)
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Question #17
The formula for calculating [H3O+] from [OH-] is ______________________. I type this into my calculator as: _______
Answer: Kw = [OH-][H3O+] = 1.0 x 10-14
[H3O+] = 1.0 x 10-14
[OH-]
1.0 E -14 / [OH-]
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Question #18
• List the formulas for pH, H+ concentration, pOH, & OH- concentration
Answer:
pH = -log [H+] OR 14 - pOH[H+] = 10^(- pH) OR 1.0 x 10-14 / [OH-]pOH = -log [OH-] OR 14 - pH[OH-] = 10^(- pOH) OR 1.0 x 10-14 / [H3O+]
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Question #19
• pH + pOH = ___________
•Answer: 14
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Question #20
What is the pH of an HCl solution with a concentration of 0.0015 M?
•Answer: pH = -log (0.0015) = 2.8
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Question #21
• What is the pH of a solution with an pOH of 10.5?
Answer: pH = 14 – pOH = 14 – 10.5 = 3.5
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Question #22
• What is the [H+] of a solution with a pH of 4.51?
Answer: [H+] = 10^(-4.51) = 3.09 x 10-5 M
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Question #23
• What is the pOH of a solution with a [H+] of 9.99 x 10-9 M?
Answer: pOH = -log [OH-]
[OH-] = 1.0 x 10-14 / 9.99 x 10-9 = 1.0 x 10-6 M
pOH = -log(1.0 x 10-6) = 6.0
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Question #24
• What is the pOH of a solution with an [OH-] of 7.81 x 10-3 M?
Answer: pOH = -log [OH-] = -log (7.81x10-3) = 2.1
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Question #25
• Calculate the [OH-] if the pOH is 5.21.
Answer: [OH-] = 10^(-5.21) = 6.17 x 10-6 M.
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Question #26
What is the purpose of a titration? What is the role of an indicator in a titration?
Answer: A titration enables you to determine the concentration of a solution by reacting a known volume of the solution with a solution of known concentration.
An indicator changes color when the end point of the titration has been reached.
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Question #27
• You add a substance to pure water and the pH rises from 7 to 9. What has happened to the concentration of H3O+? Is the substance added an acid or a base?
Answer: The concentration of H3O+ has decreased. The substance is a base.
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Question #28
• In the titration of a strong acid with a strong base, what pH range should the indicator have?
Answer: 6-8