Sunday
March 1, 2015

Homework Help: AP Chemistry

Posted by some kid on Monday, January 5, 2009 at 11:20pm.

The identity of an unknown solid is to be determined. The compound is one of the seven salts in the following table.

Al(NO3)39H2O BaCl22H2O CaCO3 CuSO45H2O NaCl

BaSO4 Ni(NO3)26H2O

Use the results of the following observations or laboratory tests to explain how each compound in the table may be eliminated or confirmed. The tests are done in sequence from a) through e).

a) The unknown compound is white. In the table below, cross out the two compounds that can be eliminated using this observation. Be sure to cross out the same two compounds in the tables in parts b, c, and d.

Al(NO3)39H2O BaCl22H2O CaCO3 CuSO45H2O NaCl

BaSO4 Ni(NO3)26H2O


b) When the unknown compound is added to water, it dissolves readily. In the table below, cross out the two compounds that can be eliminated using this test. Be sure to cross out the same two compounds in the tables in parts c and d.

Al(NO3)39H2O BaCl22H2O CaCO3 CuSO45H2O NaCl

BaSO4 Ni(NO3)26H2O


c) When AgNO3(aq) is added to an aqueous solution of the unknown compound, a white precipitate forms. In the table below, cross out each compound that can be eliminated using this test. Be sure to cross out the same compound(s) in the table in part d.

Al(NO3)39H2O BaCl22H2O CaCO3 CuSO45H2O NaCl

BaSO4 Ni(NO3)26H2O

d) When the unknown compound is carefully heated, it loses mass. In the table below, cross out each compound that can be eliminated using this test.

Al(NO3)39H2O BaCl22H2O CaCO3 CuSO45H2O NaCl

BaSO4 Ni(NO3)26H2O

e)Describe a test that can be used to confirm the identity of the unknown compound identified in part d. Limit your confirmation test to a reaction between an aqueous solution of the unknown compound and an aqueous solution of one of the other soluble salts listed in the tables. Describe the expected results of the test; include the formula(s) of any product(s).

PART D AND E ARE MOST IMPORTANT. PLEASE ANSWER THOSE FIRST IF POSSIBLE.

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