chemistry

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DATA TABLE 2: SPOT TESTS OF SUPERNATANT SAMPLES FROM REACTION TUBES
Substance Added Tube 1 Ppt.? Tube 2 Ppt.? Tube 3 Ppt.? Tube 4 Ppt.? Tube 5 Ppt.? Tube 6 Ppt.?
Pb(NO3)2 yes yes no no no no
NaI no no no yes yes yes
reagent present in excess
How do I identify whether or not reagent present in excess?

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