Double+Displacement

__Double Displacement Reactions__
__Definition__: In double displacement reactions, the ions of two compunds exchange places in aqueous solution to form two new compounds. It can be represented by the following equation:


 * AX + BY = AY+BX**

A, X, B, and Y in the equation represent ions. AY and BX represent ionic or molecular compounds.

__Simple Equation__

Li __+ KRb = LiRb+KNa__

In order to firgure out the missing substance, all you need to do is refer to the definition. By using the definition you can see that the missing substance is the " X" substance, which in the product of the equation is Na. So the missing substance is Na.

Word Equation and Balancing__ Q: Hydrocloric acid reacts with sodium hydroxide to produce sodium cloride and water.

1) The first step is to write down the symbols that match what the equation is explaining. HCl + Na(OH)-> NaCl + H2O 2) The second step is to figure out the charges of each element and do the "switcheroo". HCl + Na(OH)> NaCl+ H2O (since all of our charges were either 1 or -1, the amount of each element stays the same.) 3) The third step of the process is to make a table and balance out how many atoms of each element you have.

Element H -- Cl -- Na ---O

Reactant 2 --- 1 --- 1 - 1

Product 2 1 --- 1 1

in this equation, every element is equally balanced so we do not have to add any coefficiants to any part of the equation.

our final equation is : **HCl +Na(OH)-> NaCl + H2O

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