A student is asked to analyze a water sample from a stream for total solids (TS), dissolved solids ( — Laboratory Chemistry Chemistry Question
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.✓ Correct
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
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