Recently graduated from the ESST programme in UWI, you land a job as a technical officer in the EMA. A proposal to allow an industry to release hydrochloric acid into a small lake crosses your desk; the proposal can only be approved if the pH of the water in the lake will remain within the regulated pH range of 6 – 9 after the hydrochloric acid has been released. To assist the EMA in making their decision, the buffer capacity of the lake water is determined. Buffer capacity is a parameter similar to alkalinity, in that it indicates how much acid or base can be added to the water to achieve a pH change of 1 unit. (a) The buffer capacity of the lake is measured, and is found to be 7.95×10-4 mol/L. Given that the volume of the lake is 5.0×1010 m3 , how many moles of H+ can the lake absorb before the pH of the water drops by 1 pH unit?
Recently graduated from the ESST programme in UWI, you land a job as a technical officer in the EMA. A
proposal to allow an industry to release hydrochloric acid into a small lake crosses your desk; the proposal
can only be approved if the pH of the water in the lake will remain within the regulated pH range of 6 – 9
after the hydrochloric acid has been released. To assist the EMA in making their decision, the buffer capacity
of the lake water is determined. Buffer capacity is a parameter similar to alkalinity, in that it indicates how
much acid or base can be added to the water to achieve a pH change of 1 unit.
(a) The buffer capacity of the lake is measured, and is found to be 7.95×10-4 mol/L. Given that the volume
of the lake is 5.0×1010 m3
, how many moles of H+
can the lake absorb before the pH of the water drops
by 1 pH unit?
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