Each of the observations listed was made on a different solution. Given the obse

Question

Each of the observations listed was made on a different solution. Given the observations, state which ion studied in this experiment is present. If the test is not definitive, indicate that with a question mark.

A.) Addition of 6 M NaOH and Al to the solution produces a vapor that turns red litmus blue. Ion present: ?

B.) Addition of 6 M HCl produces effervescence. ion present: ?

C.) Addition of 6 M HNO3 plus 0.1 M AgNO3 produces a precipitate. ion present: ?

D.) Addition of 6 M HCl plus 1 M BaCl2 produces a precipitate. ion present: ?

E.) Addition of 6 M HNO3 plus 0.5 M (NH4)2MoO4 produces a precipitate. ion present: ?

Explanation / Answer

A) Addition of NaOH and Al produces vapor which turned red litmus to blue, Ion present is NH4+

B) Carbonates reacts with HCl to give CO2 gas, so this contains CO3^2- ion

C) With HNO3, AgNO3, ppt is formed, so halide is present

D) Addition of HCl and BaCl2 produced ppt. Ion present is SO4^2-

E) With HNO3 and (NH4)2MoO4 gives ppt. Ion present is PO4^3-

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