Question : 31.In which of the following salts would both the positive : 1309627

 

 

31.In which of the following salts would both the positive ion and the negative ion hydrolyze when the salt is dissolved in water?

a.NaCl

b.NaCN

c.NH4Cl

d.more than one correct response

e.no correct response

 

 

 

32.A buffer is a substance or combination of substances whose presence in an aqueous solution will

a.maintain a constant salt concentration

b.convert all weak acids to strong acids

c.keep the solution neutral

d.more than one correct response

e.no correct response

 

 

 

33.The pH of a buffered solution

a.always equals 7.0

b.may be acidic or basic depending on the buffer present

c.changes drastically when a small amount of acid is added

d.more than one correct response

e.no correct response

 

 

 

34.Which of the following statements concerning electrolytes is correct?

a.All strong acids are strong electrolytes.

b.Some salts are strong electrolytes and others are weak electrolytes.

c.Some molecular substances are strong electrolytes and others are weak electrolytes.

d.More than one correct response.

e.No correct response.

 

 

 

35.Which of the following pairings of molar amounts and equivalents is correct?

a.1 mole of Cl– ion = 1 equivalent Cl– ion

b.2 moles Ca2+ ion = 2 equivalents Ca2+ ion

c.1 mole PO43– ion = 3 equivalents PO43– ion

d.more than one correct response

e.no correct response

 

 

36.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:

(1) In Arrhenius acid-base theory, the acidic species is the hydronium ion and the basic species is the hydroxide ion.

(2) An amphiprotic substance can function as either a Bronsted-Lowry acid or a Bronsted-Lowry base.

(3) All soluble salts are strong electrolytes.

a.All three statements are true.

b.Two of the three statements are true.

c.Only one of the statements is true.

d.None of the statements is true.

 

 

 

37.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:

(1) Both members of a Bronsted-Lowry conjugate acid-base pair must contain the element hydrogen.

(2) The larger the value of the acid ionization constant for an acid, the weaker the acid is.

(3) Weak acids cannot completely neutralize strong bases.

a.All three statements are true.

b.Two of the three statements are true.

c.Only one of the statements is true.

d.None of the statements is true.

 

 

 

38.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:

(1) Formation of a coordinate covalent bond is always part of a Bronsted-Lowry acid-base reaction.

(2) The compound H2CO3 is both a strong acid and a diprotic acid.

(3) The pH of a solution with [OH-] = 1 10-8 is 6.0.

 

a.All three statements are true.

b.Two of the three statements are true.

c.Only one of the statements is true.

d.None of the statements is true.

 

 

 

39.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:

(1) The result of salt hydrolysis in aqueous solution is always a basic solution.

(2) Arrhenius acids are ionic compounds and Bronsted-Lowry acids are covalent compounds.

(3) Each successive step in the dissociation of a polyprotic acid occurs to a greater extent than the previous step.

a.All three statements are true.

b.Two of the three statements are true.

c.Only one of the statements is true.

d.None of the statements is true.

 

 

 

40.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:

(1) In aqueous solution, Arrhenius acids undergo ionization and Arrhenius bases undergo dissociation.

(2) Production of the salt NaNO3 through a neutralization reaction involves the reaction of a weak acid with a strong base.

(3) The ion product constant for water, at 24oC, has the numerical value 1.0 x 10-14.

a.All three statements are true.

b.Two of the three statements are true.

c.Only one of the statements is true.

d.None of the statements is true.