Arrange the following, insofar as possible, in order of (a) decreasing pH, and (

Question

Arrange the following, insofar as possible, in order of (a) decreasing pH, and (b) decreasing Eh. In order where the order is ambiguous, explain why. A. Seawater from near the surface in the tropics. B. Soil water from the A horizon of a temperate forest soil. C. Water from a temporary playa lake in Death Valley. D. Soil water from the A horizon of a prairie soil. E. Water from a lake in New York State. F. Water in a small stream draining an area of schist containing abundant pyrite. G. Water from a swamp in northern Canada.

Explanation / Answer

A. Seawater from near the surface in the tropics(ph 8.2). B. Soil water from the A horizon of a temperate forest soil. (3.5 to 6.5)C. Water from a temporary playa lake in Death Valley(ph 2-4). D. Soil water from the A horizon of a prairie soil.(Ph >7) E. Water from a lake in New York State (Ph <7). F. Water in a small stream draining an area of schist containing abundant pyrite.(highly acidic because of magma) G. Water from a swamp in northern Canada.(Ph 7.2)

Ph value gives us the measures of acidity and basic nature of the soil and water whereas the eH value gives the reduction potential for the soil.

for eH the values are inversely proportional which means the eH series will be just opposite to the pH series.

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