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DP IB Chemistry: HL

Topic Questions

Home / IB / Chemistry: HL / DP / Topic Questions / 18. Acids & Bases (HL only) / 18.2 Calculations Involving Acids & Bases / Multiple Choice: Paper 1

18.2 Calculations Involving Acids & Bases

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Question 1

Marks: 1

Which of the following is the acid dissociation, K_a, constant for ethanoic acid?

CH₃COOH
$\frac{[{CH}_{3} {COO}^{-}] [H^{+}]}{[{CH}_{3} COOH]}$
$\frac{[{CH}_{3} COOH]}{[{CH}_{3} {COO}^{-}] [H^{+}]}$
$[{CH}_{3} {COO}^{-}] [H^{+}]$

Key Concepts

Acid & Base Dissociation Constants

Question 2

Marks: 1

At the same concentration, which acid would have the lowest pH?

C₆H₅COOH K_a = 6.3 x 10^-5mol dm^-3
HCOOH K_a = 1.8 x 10^-4 mol dm^-3
HCN K_a= 4.9 x 10^-10 mol dm^-3
CH₃CH₂COOH K_a = 1.4 x 10^-5mol dm^-3

Key Concepts

Acid & Base Dissociation Constants

Question 3

Marks: 1

The pK_b value of ethylamine is 3.35 at 298 K. What is the value of the pK_a ethylammonium ion?

$\frac{10^{- 14}}{3.35}$
14 - 3.35
$\frac{14}{3.35}$
$\frac{10^{^{- 14}}}{10^{- 3.35}}$

Key Concepts

Acid & Base Calculations
Relating Kw to Ka

Question 4

Marks: 1

Which of the following is the correct equation to calculate the concentration of hydroxide ions?

$\frac{K_{w}}{pOH}$
-log [H⁺]
14 - pOH
10^-pOH

Key Concepts

Acid & Base Calculations

Question 5

Marks: 1

Which shows the correct relationship between K_w, K_a and K_b?

K_w = K_a + K_b
K_w = K_a K_b
$K_{w} = \frac{K_{a}}{K_{b}}$
$K_{w} = \frac{K_{b}}{K_{a}}$

Key Concepts

Acid & Base Calculations

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