Environmental scientists collect a water sample from an agricultural drainage canal
CHEMISTRY · Multi-part · A Level · Chemistry · Acids and bases · Acids and bases
Problem
Environmental scientists collect a water sample from an agricultural drainage canal. Analytical testing shows that the hydroxide-ion concentration in the sample is 7.5μM at 25 °C.
(a) Express the reported hydroxide-ion concentration in molarity using scientific notation.
(b) Determine the hydronium-ion concentration in the water sample.
(c) Calculate the pH of the sample to two decimal places.
(d) The acceptable pH range for surface waters in the region is 6.5–8.5. Assess whether this water sample meets the guideline and briefly discuss one potential environmental implication of the measured pH.