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Mathematical Methods — Question 2

QCAA 2020, Paper 2 · 1 mark

Q2 · 2020 · Technology-activeSimple familiar1 mark

QUESTION 2

The pH of a substance is a measure of its acidity and is given by the formula pH=−log⁡10[H+]\mathrm{pH}=-\log_{10}[\mathrm H^+] where [H+][\mathrm H^+] is the concentration of hydrogen ions in moles per litre. If a solution has a pH equal to 0.2, the concentration of hydrogen ions in moles per litre is closest to
(A)
0.32
(B)
0.63
(C)
0.70
(D)
1.58
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