Scheme for Unknown 2

Scheme for Unknown 2 - Cations: Na+, K+, NH4+ Anions: Cl-,...

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Cations: Na + , K + , NH 4 + Anions: Cl - , NO 3 - , SO 4 2- , HSO 4 - , OH - pH Test: Test the pH using indicators. Indicator Approximate pH Range and Corresponding Color Methyl Violet 0.0 (YG) -1.0 (BG) -2.0 (B) -3.0 (BV)-3.5 (V) Methyl Orange 3.0 (R) -4.0 (O) -5.0 (Y) Bromphenol Blue 3.0 (Y) -4.0 (G) -5.0 (BV) Bromcresol Green 3.8 (Y) -4.6 (G) -5.4 (B) Methyl Red 4.5 (RV) -5.1 (RO) -6.0 (Y) Bromthymol Blue 6.0 (Y) -7.0 (G) -8.0 (B) Thymol Blue 8.0 (Y) -9.0 (G) -10.0 (B) Phenolphthalein 9.0 (colorless) -10.0 (R) Alizarin Yellow R 10.0 (Y) -11.0 (O) -12.0 (RO) Indigo Carmine 12.0 (B) -13.0 (G) -14.0 (Y) pH Present Absent 1.5 – 2.0 HSO 4 - OH - 3.0 – 3.5 OH - 5.0 – 6.0 NH 4 + 7.0 – 7.5 Cl - , NO 3 - , SO 4 2- , Na + , K + 9.0 – 10.0 HSO 4 - , OH - 10.0 – 12.0 HSO 4 - , NH 4 + 13.0 – beyond OH - NH 4 + , HSO 4 - a.) NH 4 + = 5.0 Methyl Red (RO) b.) OH - = 13.0 Indigo Carmine (G) c.) SO 4 2- = 7.3 – 7.5 Bromthymol Blue (GB) d.) HSO 4 - = 1.5 – 2.0 Methyl Violet (BG/B) Flame Test: Flame Color Ions Present
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Scheme for Unknown 2 - Cations: Na+, K+, NH4+ Anions: Cl-,...

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