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AgNO 3 (aq) + NaCl(aq) AgCl(s) + NaNO 3 (aq) What happens when you put AgNO 3 and NaCl in water?

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Presentation on theme: "AgNO 3 (aq) + NaCl(aq) AgCl(s) + NaNO 3 (aq) What happens when you put AgNO 3 and NaCl in water?"— Presentation transcript:

1 AgNO 3 (aq) + NaCl(aq) AgCl(s) + NaNO 3 (aq) What happens when you put AgNO 3 and NaCl in water?

2 AgNO 3 (aq) + NaCl(aq) AgCl(s) + NaNO 3 (aq) What really happens when you put AgNO 3 and NaCl in water?

3 KEY POINT: NaCl (aq) really means: Na +1 (aq) + Cl -1 (aq) dissociated ions or ions in solution

4 What is Dissolving ? When an ionic compound (eg salt) dissolves in water, the compound disassociates. (breaks apart into cations and anions) Ex: Ca(NO 3 ) 2 (s) Ca 2+ (aq) + 2NO 3 - (aq) When a covalent compound (eg sugar) dissolves in water, the molecules simply disperse; they do not disassociate. Molecules of the covalent compounds simply disperse due to attraction with polar water molecules.

5 An Ionic Compound Dissolves: A Covalent Compound Dissolves:

6 KEY POINT: Mg(NO 3 ) 2 (aq) really means: Mg +2 (aq) + (NO 3 ) -1 (aq) 2 dissociated ions or ions in solution

7 KEY POINT: AgCl (s) really means: AgCl (s) Solid Silver (I) Chloride.

8 AgNO 3 (aq) + NaCl(aq) AgCl(s) + NaNO 3 (aq) What happens when you put AgNO 3 and NaCl in water?

9 AgNO 3 NaCl

10 Ag + NO 3 - Na + Cl -

11 Ag + NO 3 - Na + Cl -

12 AgCl NO 3 - Na +

13 AgCl NO 3 - Na + AgCl(s) precipitate

14 NO 3 - Na + NO 3 - Na + NO 3 - Na + NO 3 - Na + NO 3 - Na + NO 3 - Na + NO 3 - Na + NO 3 - Na + AgCl(s)

15 AgNO 3 (aq) + NaCl(aq) AgCl(s) + NaNO 3 (aq) complete ionic equation

16 NO 3 - Na + AgCl Reaction

17 AgCl NO 3 - Na + No Reaction

18 AgCl NO 3 - Na + These ions do not participate in the reaction. They are called SPECTATOR IONS

19 The net ionic equation is constructed from the complete ionic equation:

20 NO 3 - and Na + are not participating in the reaction

21 net ionic equation

22

23 –Complete molecular equation- describes double replacement reaction –Complete ionic equation- more accurately shows the reacting species as ions and the products either as ions or a precipitate –Net ionic equation- focuses only on the ions REACTING –Spectator ions are those ions that do NOT participate in the reaction

24 PREDICTING THE FORMATION OF A PRECIPITATE Consider the possibility that a precipitate may form. Must use the solubility table on page 227 to decide. Possible outcomes –No visible reaction (nvr) –Formation of one ppt. –Formation of two ppt. (rare occurrence)

25 Basic Chemical equation AgNO 3 (aq) + KCl (aq) AgCl (s) + KNO 3 (aq) Complete ionic equation shows ions in solution Ag + (aq) + NO 3 (aq) + K + (aq) + Cl - (aq) AgCl(s) + K + (aq) + NO 3 - (aq) Net ionic equation shows ions in rxn Ag + (aq) + Cl - (aq) AgCl(s) (leave out spectator ions) link


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