Download presentation
Presentation is loading. Please wait.
PublishMadeline Knight Modified over 9 years ago
1
Net Ionic Equations
2
Interesting Fact: The BENDS Deep sea divers may experience a condition called the "bends" if they do not readjust slowly to the lower pressure at the surface. As a result of breathing compressed air and being subjected to high pressures caused by water depth, the amount of nitrogen dissolved in blood and other tissues increases.
3
If the diver returns to the surface too rapidly, the nitrogen forms bubbles in the blood as it becomes less soluble due to a decrease in pressure. The nitrogen bubbles can cause great pain and possibly death
4
Net Ionic Equations In aqueous solutions, ionic compounds dissociate into their ions. E.g. Sr(NO 3 ) 2(aq) → Sr 2+ (aq) + 2NO 3 - (aq) Total ionic equations show all dissociated ions of soluble ionic compounds. Spectator ions are ions that remain in solution and therefore are not involved in a chemical reaction. Net ionic equations show only ions involved in a chemical reaction (I.e. spectator ions are NOT included)
5
An Example The reaction between aqueous sodium chloride & silver nitrate. Chemical Equation: NaCl (aq) + AgNO 3(aq) NaNO 3(aq) + AgCl (s) Total Ionic Equation: Na + (aq) + Cl - (aq) + Ag + (aq) + NO 3 - (aq) Na + (aq) + NO 3 - (aq) + AgCl (s) Net ionic Equation: Ag + (aq) + Cl - (aq) AgCl (s)
6
Remember the Solubility Table? You need to use the solubility table to predict if there is going to be a precipitate.
7
Another Example The reaction between aqueous sodium chloride & magnesium nitrate. Chemical Equation: 2 NaCl (aq) + Mg(NO 3 ) 2(aq) 2 NaNO 3(aq) + MgCl 2(aq) Total Ionic Equation: 2Na + (aq) + 2Cl - (aq) + Mg 2+ (aq) + 2NO 3 - (aq) 2Na + (aq) + 2NO 3 - (aq) + Mg 2+ (aq) + 2Cl - (aq) Net ionic Equation: No reaction!
8
Write the total ionic eq'n and the net ionic eq'n for the reaction that occurs when lead (II) nitrate and potassium iodide combine.
9
Write the net ionic equation for aluminum metal being placed in a solution of copper (II) chloride.
10
Identifying Ions Today we can use a mass spectrometer to determine the ions present. Various techniques were used in the past. These techniques are still used today for qualitative analysis. o Review Table 9.1 and 9.2 on page 411-412. These tables show the colour of common ions in solutions and the colour produced by an ion in a flame test. o Read pg 411-412 & complete Activity 9.2 on pg.413.
11
Practice p. 414 #5a, 10, 12, 14a
Similar presentations
© 2024 SlidePlayer.com. Inc.
All rights reserved.