Unknown 1(2) - U nknown 2A/2B Scheme of Analysis Possible...

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Unknown 2A/2B: Scheme of Analysis Possible: Cations: Na+, K+, NH4+ Anions: OH-, Cl-, SO4(2-), HOSO3-, NO3- Prepare Neutral Water: Clean beaker with deionized water and test with HBtB indicator, should be slightly yellow (slightly acidic) Neutralize by adding a few drops of tap water until turns green with HBtB 1. Description: phase, solubility, color, odor, shape (texture) 2. Test original sample in flame test Bright orange: Na+ present, doesn’t exclude K+ or NH4+ Light purple: K+ present & possible NH4+, Na+ not present no color: possibly NH4+ present 3. pH solution preparation add ½ unknown to 10-15 mL of neutral water immediately test for pH levels with indicators Indicators: Thymol Blue (HTB/TB-) 8.0(Y) 9.0(G) 10.0(B) Bromthymol Blue (HBtB/BtB-) 6.0(Y) 7.0(G) 8.0(B) o If base: Alizarin Yellow R (HAY/AY-) 10.0(Y) 11.0(O) 12.0(RO) Indigo Carmine (HIC/IC-) 12.0 (B) 13.0(G) 14.0(Y) o If acid: Methyl Violet (HMB/MV-) 0.0(YG) 1.0(BG) 2.0(B) 3.0(BV) 3.5(V) Methyl Orange (HMO/MO-) 3.0® 4.0(O) 5.0(Y) Methyl Red (HMR/MR-) 4.5 (RV) 5.1(RO) 6.0(Y) 4. pH of common anions/cations
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1.5-2.0: HSO4- present; CO32-, HCO3-, OH- not present
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