A student is asked to analyze a water sample from a stream for total solids (TS)

Question

A student is asked to analyze a water sample from a stream for total solids (TS), dissolved solids (DS), and suspended solids (SS). She carries out the experiments below. 1. A 25-mL portion of the water sample is evaporated to dryness in a pre-weighed evaporating dish to give mass 1. 2. A separate 25-mL portion is filtered into a second pre-weighed evaporating dish and evaporated to dryness to give mass 2. How are values for TS, SS and DS (per 25 mL water) determined? (A) TS = mass 1, SS = mass 1 – mass 2, DS = mass 2 (B) TS = mass 1, SS = mass 2, DS = mass 1 – mass 2 (C) TS = mass 1 + mass 2, SS = mass 1, DS = mass 2 (D) TS = mass 1 + mass 2, SS = mass 2, DS = mass 1 A student is asked to analyze a water sample from a stream for total solids (TS), dissolved solids (DS), and suspended solids (SS). She carries out the experiments below. 1. A 25-mL portion of the water sample is evaporated to dryness in a pre-weighed evaporating dish to give mass 1. 2. A separate 25-mL portion is filtered into a second pre-weighed evaporating dish and evaporated to dryness to give mass 2. How are values for TS, SS and DS (per 25 mL water) determined? (A) TS = mass 1, SS = mass 1 – mass 2, DS = mass 2 (B) TS = mass 1, SS = mass 2, DS = mass 1 – mass 2 (C) TS = mass 1 + mass 2, SS = mass 1, DS = mass 2 (D) TS = mass 1 + mass 2, SS = mass 2, DS = mass 1 A student is asked to analyze a water sample from a stream for total solids (TS), dissolved solids (DS), and suspended solids (SS). She carries out the experiments below. 1. A 25-mL portion of the water sample is evaporated to dryness in a pre-weighed evaporating dish to give mass 1. 2. A separate 25-mL portion is filtered into a second pre-weighed evaporating dish and evaporated to dryness to give mass 2. How are values for TS, SS and DS (per 25 mL water) determined? (A) TS = mass 1, SS = mass 1 – mass 2, DS = mass 2 (B) TS = mass 1, SS = mass 2, DS = mass 1 – mass 2 (C) TS = mass 1 + mass 2, SS = mass 1, DS = mass 2 (D) TS = mass 1 + mass 2, SS = mass 2, DS = mass 1

Explanation / Answer

when filtered, suspended solids are removed, hence the sample when evaporated, the sample gives dissolved solids. ( This is m2). With out filtration, when samples are evaporated, it gives Total solids m1.

Suspended solids = m1-m2 . Hence A is correct.

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