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Date	May 2011	Marks available	1	Reference code	11M.1.hl.TZ1.28
Level	HL	Paper	1	Time zone	TZ1
Command term	Solve	Question number	28	Adapted from	N/A

Question

The ${K_{\text{b}}}$ value for a base is $5.0 \times {10^{ - 2}}{\text{ mol}}\,{\text{d}}{{\text{m}}^{ - 3}}$ at 298 K. What is the ${K_{\text{a}}}$ value for its conjugate acid at this temperature?

A. $5.0 \times {10^{ - 2}}$

B. $2.0 \times {10^{ - 6}}$

C. $2.0 \times {10^{ - 12}}$

D. $2.0 \times {10^{ - 13}}$

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Syllabus sections

Additional higher level (AHL) » Topic 18: Acids and bases » 18.2 Calculations involving acids and bases

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