A sample of a monoprotic acid solution has a pH of

CHEMISTRY · Single correct · A Level · Chemistry · Acids and bases · Acids and bases

Problem

250\,\text{mL}

sample of a monoprotic acid solution has a pH of

2.60

. Assuming the density of the solution is

1.00\,\text{g}\,\text{mL}^{-1}

and that hydronium ions have a molar mass of

19.0\,\text{g}\,\text{mol}^{-1}

, what is the mass of hydronium ions present in the entire sample? (a)

1.2\times10^{2}\,\text{mg}

(b)

1.2\,\text{mg}

(c)

1.2\times10^{1}\,\text{mg}

(d)

6.3\times10^{-1}\,\text{mg}