How do I do this lab? 5. What temperature change did you observe when ammonium c

Question

How do I do this lab?

5. What temperature change did you observe when ammonium chloride was dissolved in water? 6. What does such a temperature change indicate and is this consistent with what you observed in question 3? Explairn B. COMMON ION EFFECT ON A CHEMICAL SYSTEM Add 1 ml of 0.1 M iron (II) chloride (FeCl3) solution and 1 mL of 0.1 M potassium thiocyanate (KSCN) solution to a 50 mL graduated cylinder. Now add distilled water to the 50 mL mark! Use a glass rod to mix to a uniform color. Transfer 5 mL using a plastic pipet into 7 labelled test tubes. Record the color of the solution in the test tubes, which should be the same as the color of the control solution! Each test tube contains aqueous ferric ions, thiocyanate ions, and ferri-thlocyanate ions in a state of dynamic equilibrium. The equilibrium expression is: praduct FeSCN2+ (aq) reactants +, 2SCN-(aq) Pale Yellow Colorless Blood red Of these three ions, Fe3+ (pale yellow), SCN is colorless, and (Fe(SCN))2+ is blood red colorless, and (Fe(SCN))2* is blood red

Explanation / Answer

Ans 5 :

The dissolution of ammonium chloride in water is an endothermic reaction.

When the compound is added into the water , the water gives its energy to break the molecules , so the compound dissociates to form ammonium and chloride ions and the temperature of the solution drops.

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