CHM2046 Unknown #2

CHM2046 Unknown #2 - CHM2046 Scheme of analysis Unknown #2...

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CHM2046 Scheme of analysis Unknown #2 Brian Rojas 6/25/2010
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*When given the unknown sample: - Describe sa mple: Phase, solubility, color, odor, shap e - Weight sa mple. - Divide sa m ple in two e qu al p arts - Mix ½ of the unknown sa m ple with 10 mL of D.i. water (pH = 7.0) to m ake an unknown solution. pH Test - Always b egin testing with BtB (Bromothynol Blue) indicator to d eter mine if unknown is acid or bas e. - If unknown’s pH is > 7 unknow is a b ase, and we should proceed to test with tb(Thymol Blue) indicator. - If unknown’s pH is < 7 unknown is acid, and we should proce ed to test with AY (Alizarine Yellow) indicator. pH Present pH Present 2-3 Al³ 1-2 HSO¯ /SO ² ¯ 4-6 NH ₄⁺ 8-10 HCO ¯ 6 Mg² 11-14 CO ²¯/OH¯ 6-7 Na 7 Ca² /Ka Flame Test
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*For this experiment we will use Nichrome® wire, bit before we can use it we must clean it to make sure there are no contaminants that can interfere with our data. -
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CHM2046 Unknown #2 - CHM2046 Scheme of analysis Unknown #2...

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