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.
(P) A 25-mL portion of the water sample is evaporated to dryness in a pre-weighed evaporating dish to give mass 1 .
(Q) 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?

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TS= mass 1+ mass 2,SS= mass 2, DS= mass 1

TS= mass 1+ mass 2,SS= mass 1, DS= mass 2

TS= mass 1,SS= mass 2, DS=mags1- mass 2

(a) TS= mass 1,SS= mass 1- mass 2, DS= mass 2

answer is A.

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Detailed Solution

(P) $\to D S + S S = m_{1} = T S$

(Q) $\to D S = m_{2}$

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