please help, thanks B. COMMON ION EFFECT ON A CHEMICAL SYSTEM Add 1 ml of 0.1 M
ID: 591273 • Letter: P
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please help, thanks
B. COMMON ION EFFECT ON A CHEMICAL SYSTEM Add 1 ml of 0.1 M iron (III) chloride (FeCls) 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 ferricions, thiocyanate ions, and ferri-thlocyanate ions in a state of dynamic equilibrium. The equilibrium expression is praduct rrd reactants Fe3+ (aq) 25CN-(aq) Fes +, Pale Yellow Colorless Blood red Of these three ions, Fe3+ (pale yellow), SCN is colorless, and (Fe(SCN))2+ is blood red.Explanation / Answer
According to La -chatelier's principle any change in the concentration of a chemical shift the equilibrium to the side that reduce the change in concentration of the chemical.
So , when FeCl3 is added to the solution of test tube 2, there is an increase in concentration of Fe3+ ion in the solution.For this, the equlibrium will be disturbed and according to La -chatelier's principle the equlibrium will be shifted to the direction where Fe3+ ion is consumed that means to the forward direction) hence more [Fe(SCN)]2+ ion will be formed, consequently the color of the solution becomes more intense.
answer of 7
The color of the solution becomes more intense blood red.
answer of 8
The equlibrium shifted to the direction where Fe3+ ion was consumed that means to the right direction, so more products had formed.
answer of 9
Fe3+ has caused the stress in the system. It is the commom ion present in the system.
answer of 10
When SCN- ion is added to the solution of test tube, there is an increase in concentration of the ion in the solution. For this, the equlibrium will be disturbed and according to La -chatelier's principle the equlibrium will be shifted to the direction where SCN- ion is consumed that means to the forward direction) hence more [Fe(SCN)]2+ ion will be formed
A. Here thiocyanate ion is responsible for the shift, now this SCN- ion is the common ion.
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