can anyone help? Question 6 (5 points) Which of the following will increase when HF is...
I need help with problems from a practice exam involving acids and bases QUESTION 1 Complete the following equation: (CH3)3N + H2O --> (CH3)3NH+ + –OH (CH3)3NH+ + H3O+ (CH2)3N + H3O+ H(CH3)3N + –OH No reaction 1 points QUESTION 2 The pH of a 0.500 M solution of an unknown acid (HA) is 6.45 at 25 ⁰C. Determine the value of the equilibrium constant for this acid at 25 ⁰C. 3.55 x 10–7 2.82 x 10–8 2.52 x 10–13 1.59...
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Question 16 (5 points) If the Keq of the following reaction is 0.38, 2A (9) + 3B (s) = 7C (), what is the Keq of the reaction below? 14C (0) = 4A (9) + 6B (s) 5.26 O 0.760 1.12 6.93 0.144 Question 17 (5 points) Al 105°C. AsEs decomposes into ASF3 and F2 according to the following chemical equation. Question 17 (5 points) At 105°C, AsF5 decomposes into AsF3 and F2 according to the...
Salt Hydrolysis: Hydrolysis at the Endpoint of a Titration Consider the following equation: NH3 (aq) + HBr (aq) → NH4Br (aq) + H2O (l) Here the neutralization reaction is creating ammonium bromide. If you add enough strong acid to react with all of the weak base, all that will remain will be ammonium bromide and water. The conjugate acid from this salt will hydrolyze in solution to determine the pH at this point. Weak Acid Ka Weak Base Kb CH3COOH...
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Question 21 (5 points) Which of the following is true for the conjugate base of a strong acid? The conjugate base of a strong acid acts as a weak acid. As the strength of the acid increases, the strength of the conjugate base decreases. The conjugate base of a strong acid is a strong base. As the strength of the acid increases, the strength of the conjugate base also increases. Question 22 (5 points) The Ksp...
6) Which of the following statements is true? A) If Q = K, it means the reaction is not at equilibrium B) If Q< K, it means the forward reaction will proceed (to the right) to form more reactants. C) If Q< K, it means the reverse reaction will proceed (to the left) to form more reactants. D) If Q> K, it means the forward reaction will proceed (to the right) to form more reactants E) If Q> K, it...
SOS
Question 11 (5 points) What is the equilibrium expression for the following reaction? 2Ag (s) + Cl2 (g) = 2AgCl (s) OK = 1/[C12] OK = [Agci12 / [Ag] OK = [Ag]?[c12] OK = [Agci12 / ([Ag]?[Cl2)) OK = (AgCl2 Question 12 (5 points) What is true of the percent inition OK = [AgCl2 Question 12 (5 points) What is true of the percent ionization of a weak acid as the concentration of the weak acid increases? the percent...
Determine the conjugate base for each of the following acids: HSO4- CH3CH2COOH Identify all of the acids and bases in the following reaction. Predict which direction the reaction will favor (forward or reverse). HNO3 (aq) + NaF (aq) ↔ HF (aq) + NaNO3 (aq) Rank the following acids according to strength: Acid Ka HF 3.5 x 10-4 H3PO4 7.5 x 10-3 Ascorbic acid 7.9 x 10-5 Which conjugate base would be the strongest? The pH of...
Which of the following is the strongest acid? CH3COOH, Kg = 1.8 x 10-5 HF, KA = 3.4 x 10-4 O HNO2, Kg = 4.6 x 10-4 HCN, KA = 4.9 ~ 10-10 HCIO, KA = 3.0 x 10-8
Question 10 Which of the following IS a strong acid (1 point ) * H2SO4 HCN HF NH3 Question 11 Write the equilibrium expression for a simple acid ionization. (HA (aq) -> H+ + A-) (1 point ) * Ka = ([H+][A-])/[HA] Ka = [H+]/[HA] Ka = [H+][A-] None of the above Question 12 Write the equilibrium expression for the following reaction. HF (aq) -> H+ (aq) + F- (aq) (1 point ) * Ka = ([H+][F-])/[HA] Ka = [H+]/[HA]...
help with 5 and 6 please
5. Choose the effective pH range of a HF/Naf buffer. For HF, Ka = 3.5 x 10-4 6. If a small amount of a strong acid is added to buffer made up of a weak acid, HA, and the sodium salt of its conjugate base, NaA, the pH of the buffer solution does not change appreciably because a) the Ka of HA is changed. b) the strong acid reacts with Ato give HA, which...