Harris Quantitative Analysis Chapter 10 | Baamboozle - Baamboozle

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What is the principal form of benzoic acid at pH = 6.00?

Benzoate

Benzoic Acid

Which equation shows the correct relationship between the Ka and Kb values for a diprotic species?

Ka1 × Kb2 = Kw

Ka1 × Kb1 = Kw

Ka1 × Ka2 = Kw

Kb1 × Kb2 = Kw

(T or F) For most diprotic species, the acidic (H2A) and basic (A2−) forms can be treated as monoprotic species when calculating the pH of a solution.

False

True

Which of the following is FALSE for an aqueous solution of the weak acid H3A?

HA^2-

H3A is acidic.

A^3− is acidic.

HA2− is amphiprotic.

What is the pH of a 0.100 M maleic acid (pK1 = 1.89, pK2 = 6.23) solution?

8.50

1.52

5.74

1.23

Which one of the following pairs cannot be mixed together to form a buffer solution?

H3PO4, KHPO4

RbOH, HBr

NaC2H3O2, HCl (NaC2H3O2 = acetate)

KOH, HF

(T or F)A buffer made from a diprotic acid is treated in the same way as a buffer made from a monoprotic acid.

False

True

What is the principal form of benzoic acid at pH = 3.00?

Benzoate

Benzoic Acid

10 The Ka of acetic acid is 1.7 *10-5 The pH of a buffer prepared by combining 50.0 mL of 1.00 M potassium acetate and 50.0 mL of 1.00 M acetic acid is __________.

9.37

7

9.26

4.77

(T or F) The following reaction is an example a hydrolysis reaction: L− + H2O<====>HL + OH−

True

False