Chapter 2, Problem 79P

Will acetylene react with sodium hydride according to the following equation to form a salt and hydrogen, H2? Using pKa values given in Table 4.1, calculate Keq for this equilibrium.

Calculate Ka for the weak acids that have the following PKa values. (a) 3.9(b) 10.12 (c) 13.07

Define or illustrate the meaning of the following terms: a. Ka reaction b. Ka equilibrium constant c. Kb reaction d. Kb equilibrium constant e. conjugate acidbase pair

Sulfanilic acid, which is used in making dyes, is made by reacting aniline with sulfuric acid. (a) Is aniline a Brnsted base, a Lewis base, or both? Explain, using its possible reactions with HCl, BF3, or other acid. (b) Sulfanilic acid has a pKa value of 3.23. The sodium salt of the acid, Na(H2NC6H4SO3), is quite soluble in water. If you dissolve 1.25 g of the salt in water to give 125 ml, of solution, what is the pH of the solution?

Another way to express acid strength is by using pk b:pK a =−logK a Another way to express base strength is by using pK b pK b =−logK b A new potential heart medicine, code-named X-281, is being tested by a pharmaceutical company, Pharma-pill. As a research technician at Pharma-pill, you are told that X-281 is a monoprotic weak acid, but because of security concerns, the actual chemical formula must remain top secret. The company is interested in the drug's K a value because only the dissociated form of the chemical is active in preventing cholesterol buildup in arteries.To find the pK a of X-281, you prepare a 0.079 M M test solution of X-281 at 25.0 ∘ C The pH of the solution is determined to be 3.00. What is the pK a of X-281?

Describe the acidity/basicity of each species and estimate the position of each equilibrium. CH3CH₂O + CH3C=CH CH3CH₂OH + H3CC=C b d a On the left, a is the and b is th✓ On the right, c is the and d is tl The species favored at equilibrium are those stronger acid stronger base weaker acid weaker base C C

Arrange the following carboxylic acids in order of acidity. CN COOH ба -COOH .COOH .COOH مي سي مي C "CN NOW a b The strongest acid is The second strongest is The third strongest is The weakest acid is d

In the following reaction which compound is a conjugate base? NH CN D HCN + NH3 A Oc OA B D.

(a) Does a strong acid have a greater or lesser tendency to lose its proton than a weak acid? (b) Does the strong acid have a higher or lower Kathan the weak acid? (c) Does the strong acid have a higher or lower pKathan the weak acid?