Nitrate (NO3-)
1) Fill clean test tube with 5ml of water
2) Add 10 drops from Bottle #1
3) Invert tube several times to mix
4) Vigoursly shake Bottle #2 for at least 30 seconds.
5) Add 10 drops of Bottle #2
6) Shake vigorously for 60 seconds.
7) Wait 5 minutes.
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