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Embed code for: SI Review #2 2017 Chem 114
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Chem 114 SI Review 2
What makes an acid strong?
HCl - hydrochloric acid HNO3 - nitric acid H2SO4 - sulfuric acid HBr - hydrobromic acid HI - hydroiodic acid HClO4 - perchloric acid
A titration of 10 mL of 1.0 M of NaOH with 40 mL of 4.0 M HF what would the pH at the equivalence point be?
Less than 7
Greater than 7
A and B
I don’t know
Determine the pH of a 0.5 M solution of HCl ka=4.00 x 108
Which of the following is always true about pure water at 30 degrees Celsius ? I. pH = 7 II. pOH = 7 III. [H+] = [OH-]
I & II
II & III
all of the above
Which of the following is always true about pure water at 30 degrees Celsius? I. pH = 7 II. pOH = 7 III. [H+] = [OH-]
What is the pH of a 0.4M solution of KF? HF Ka=6.9 x 10⁻⁴
If I had wanted a buffer solution with 1.0 M solution of KCN which acid/bases could I use?
1.0 M HCN
0.5 M HCN
0.5 M HCl
1.0 M HCl
2.0 M HCl
H2(g) + Br2(l) ↔ 2HBr(g) ∆H = -72.6 kJ/mol Increasing the temperature will: I. Cause the reaction to make more products II. Cause the equilibrium constant to increase III. Cause the reaction to make more reactants
I & III
Consider the following reaction. 3 H2(g) + N2(g) ⇌ 2 NH3(g) The moment excess NH3 is added to the following reaction what is the relationship between Qc and Kc
Qc > Kc
Qc = Kc
Kc < Qc
What is the equilibrium constant of the following reaction at 25 ◦C? ClO − 2 (aq) + H2O(l) ⇄ HClO2 (aq) + OH− (aq)
9.1 × 101
1.1 × 1012
1.0 × 10-7
9.1 × 10-13
1.1 × 10-2
A solution of 2.0 M HF and 0.4 M KF has a pH of 8.9 what is the pKa?
If K > 1…
Reactants are more stable than products
Products are more stable than reactants
Gibbs Free energy > 0
Gibbs Free energy < 0
A and C are correct
B and D are correct
Which molecules are spectator ions in aqueous form?
A and D
A and C
A, B, and C
What is the pH of a saturated solution at equilibrium containing magnesium hydroxide?
What is the pH of a pure water substance at 40ᵒ Celsius?
Is a 1.0 M solution of NaF(aq) acidic, basic, or neutral; and what is its pH at 25 ◦C? Assume that NaF is a strong electrolyte.
acidic, pH < 7
acidic, pH > 7
basic, pH < 7
basic, pH > 7
neutral, pH = 7
Given the following data find the Gibbs free energy at 25 C. Determine Spont. Or nonspont.
Δ S=121.212 J/mol *K
Δ H=37.21 Kj /mol*K
What is the equilibrium constant of the following reaction at 25 ◦C? HNO2 (aq) + ClO− (aq) ⇄ NO − 2 (aq) + HClO(aq)
2.2 × 1011
1.4 × 104
7.1 × 10-5
5.6 × 10-4
4.0 × 10-8
4.0 × 10-8er at 30 degrees Celsius? I. pH = 7 II. pOH = 7 III. [H+] = [OH-]
Is a 1.0 M solution of NaF(aq) acidic, basic, or neutral; and what is its pH at 25 ◦C? Assume that NaF is a strong