A laboratory has a stock solution of a strong monoprotic acid with a measured pH of at

CHEMISTRY · Multi-part · A Level · Chemistry · Acids and bases · Acids and bases

Problem

A laboratory has a stock solution of a strong monoprotic acid with a measured pH of

1.50

25^\circ\text{C}

. A technician dilutes

10.00\,\text{mL}

of this stock acid to a final volume of

500.0\,\text{mL}

using deionized water. (a) Calculate the hydronium-ion concentration in the original stock solution. (b) Determine the hydronium-ion concentration in the diluted solution after the

10.00\,\text{mL}

aliquot is brought to

500.0\,\text{mL}

total volume. Assume volumes are additive. (c) Compute the pH of the diluted solution, expressing the result with the correct number of significant figures. (d) For a

250.0\,\text{mL}

portion of the diluted solution, calculate the mass (in grams) of hydrogen ions present. Express your answer in scientific notation.

Related theory

Equilibrium
PH and ionic product
The pH scale
Ionic Equilibrium and pH
pH scale

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