Unknown Solutions And Ammonium Salts Lab Report

Identification of Unknown Solutions and Ammonium Salts preAice Chemistry Lab Report

Descriptions of unknown solutions:

Unknown
Descriptions
A
Clear, colorless, odorless liquid.
B
Clear, colorless, odorless liquid.
C
Clear, red-brown, odorless liquid
D
Clear, yellow-orange, odorless liquid.

Observations of unknown solutions:

Unknown
NaOH
HNO3 & AgNO3
Diluted HNO3 & BaCl2
HCl
A
No reaction
(+)Yellow ppt. formed
Did not test
(+)Effervescence
(bubbles)
B
No reaction
(+) Yellow ppt. Formed
No reaction
No reaction
C
(+) Rusty-brown ppt.
No reaction
No reaction
(+) White ppt.
D
(+) Green ppt.
(+) White ppt.
No reaction
No reaction

Conclusion for solutions:
In the unknown A solution it cannot be determined what the cation and anions of the solution are, however it is possible that the cation for unknown A could be represented through the equation: __2CO3(aq)+NaOH(aq) -->__OH()+Na2CO3(aq) and possible

In attempt to identify Unknown A three different reagents were used. In the first test five drops of NaOH was added to Unknown A, no apparent reaction occurred therefore there was no cation present. Another fraction of Unknown A was tested with diluted HNO3 and five drops of AgNO3 which formed a yellow precipitate however, it was later discovered that this test was a false positive for anions. A final fraction of Unknown A was tested with five drops of HCl to test for CO3 anions. The result of this test was effervescence (bubbles), this suggested that Unknown A was positive for CO3. The chemical equation for the cation of Unknown A is: ___2CO3(aq) + NaOH(aq) →___OH + Na2CO3(aq), because there was no reaction when NaOH was added to the solution, the only possible cations would be an alkali, NH4, Ba, Sr, and Ca. The chemical equation representing the anion is ___2 CO3 (aq) + HCl (aq) → ___Cl (aq) + H2O(l ) + CO2(g) with the same selection of