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Double Replacement Reactions:)
Learn about precipitate-s!
What is it?
A double replacement reaction is when two elements switch places in a chemical reaction.
It occurs when two ionic compounds are mixed together. In water these ionic compounds split apart into anions and cations, creating an opportunity for cations to swap anions. As long as the equation they form is balanced. A reaction occurs if, by swapping anions, a product is formed that cannot split apart into anions and cations.
How does it happen?
For example:)
Calcium Chloride + Sodium Sulphate = CaCl2(2) + Na2SO4 CaSO4 and Na2Cl2 Silver Nitrate + Sodium Chloride = AgNO3 + NaCl AgCl and NaNO3 Calcium Chloride + Silver Nitrate = CaCl2(2) + AgNO3 CaNO3 and AgCl2
Balanced Equations:
The reaction of silver nitrate and potassium chloride; The silver, nitrate, potassium and chloride ions all begin in a solution. When a silver ion combines with a chloride ion, it leaves the solution and becomes a solid. This drives the reaction to completion! So we end up with the substances switching places to form: AgNO3 + KCl > AgCl + KNO3
Remember: A double replacement reaction occurs only if the reaction produces a solid, a gas, or water.
How do you know?
To determine the products in a double replacement reaction you can do the math! Everything should add up.
Test Yourself!:)
