1. Which silver halide precipitate(s) dissolved when sodium thiosulfate was adde

Question

1. Which silver halide precipitate(s) dissolved when sodium thiosulfate was added?

A. silver chloride only

B. silver fluoride and silver chloride

C. silver bromide and silver chloride

D. silver bromide and silver iodide

2. If you were allowed to react your unknown halides with only one of the reagents used in this lab, which reagent will you pick and why?

A. sodium thiosulfate because it changes the color of the halide solution.

B. Silver nitrate because it forms different color precipitates with the two halides.

C. Ammonia because it forms color precipitat4es with both halides.

D.Calcium nitrate because it forms a pecipitate with only one of the halides.

3. Given the observations recorded in the table below, what is the identity of the unknown halide?

A. chloride

B. Fluoride

C. Bromide

D. Iodide

4. What is the balanced equatiion for magnesium chloride hydrate?

A. MgCl2 x 6H2O (s) = MgCl2 (s) + 6H2O (g)

B. MgCl2 x 5H2O (s) = MgCl2 (s) + 5H2O (g)

C. MgCl2 x 6H2O(s) = 6MgCl2(s) + H2O (g)

D. MgCl2 x H2O (s) = MgCl2 (s) + 6H2O (g)

Ca(NO3)2 AgNO3 AgNO3 + NH3 white precipitate that Unknown Halide no change white precipitate dissolves in ammonia AgNO3 Na2S20s white precipitate that dissolves in Na2S203

Explanation / Answer

Ans 1 C) Silver bromide and silver chloride

Sodium thiosulfate dissolves the silver bromide and forms silver thiosulfate.

Silver chloride forms in the reaction as a white precipitate. It dissolves in sodium thiosulfate to give a colorless solution.

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