Question
In: Chemistry
Based on the following table, determine what each of the unknown substances are from the following...
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Based on the following table, determine what each of the unknown substances are from the following list. |
Unknown Possibilities glycine calcium carbonate aluminum iron (III) oxide adipic acid dodecyl alcohol iron silicon sodium carbonate potassium nitrate salicylic acid graphite |
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| Sample | Appearence | H2O Soluble? | Hexane Soluble? | Ethyl Alcohol Soluble? | Melting Point | Conductivity in solid | Conductivity in aqueous | pH | Rxn in HCl? | Rxn in NaOH? | ||||||||||
| #4 | Clear Crystals | Insoluble | Soluble | Soluble | <100 | No | No | 6 | No Rxn | No Rxn | ||||||||||
| #8 | Black Powder Insoluble | Insoluble | Insoluble | >100 | No | Yes | 6 | Rxn occurs | No Rxn | |||||||||||
| #10 | White Crystals Insouble | Soluble | Soluble | Unknown | No | Yes | 3 | No Rxn | No Rxn | |||||||||||
| #5 | White Powder Soluble | Insoluble | Insoluble | >100 | No | No | 7 | No Rxn | No Rxn | |||||||||||
| #6 | Black Powder Insoluble | Insoluble | Insoluble | <100 | Yes | Yes | 6 | No Rxn | No Rxn | |||||||||||
| #11 | Shiny Gray Solid Insoluble | Insoluble | Insoluble | Unknown | Yes | Yes | 6 | No Rxn | No Rxn | |||||||||||
| #2 | Shiny Gray Solid Insoluble | Insoluble | Insoluble | Unknown | Yes | Yes | 5 | No Rxn | No Rxn | |||||||||||
| #9 | White Crystals | Soluble | Soluble | Insoluble | Unknown | No | Yes | 4 | Rxn Occurs | Rxn Occurs | ||||||||||
| #7 | Red powder | Insoluble | Insoluble | Soluble | >100 | No | Yes | 6 | No Rxn | No Rxn | ||||||||||
| #12 | white powder Soluble | Souble | Insoluble | >100 | No | Yes | 12 | Rxn Occurs | No Rxn | |||||||||||
| #3 | White solid | Soluble | Insoluble | Insoluble | Unknown | No | Yes | 7 | Rxn Occurs | No Rxn | ||||||||||
| #1 | White solid | Insoluble | Insoluble | Insoluble | Unknown | No | No | 6 | No Rxn | No Rxn | ||||||||||
Solutions
Expert Solution
The possible compounds are
glycine : white solid , melting point greater than 100 , soluble in water, sparingly soluble in alcohol, reacts with HCl ((sample # 3)
calcium carbonate : White powder , slightly soluble in water , insoluble in hexane and alcohol , rxn occurs with HCl
aluminum : Shiny gray ((sample # 2)
iron (III) oxide : red coloured (((sample # 7)
adipic acid : White crystals (((sample # 9), soluble in water
dodecyl alcohol: colourless , soluble in ethanol , melting point less than 100 (((sample # 4)
iron : melting point very high, ((sample # 8)
silicon: high melting point , not soluble ((sample # 10)
sodium carbonate : pH greater than 7 (((sample # 12)
potassium nitrate : white solid, soluble in water soluble , conducting, ((sample # 3)
salicylic acid :colorless crystalline : melting point greater than 100 and is known cant say
graphite : shiny gray solid , insoluble in water (sample # 11)
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