AB + CD + energy --> AD + CB
Double replacement reaction
acid + base → salt + water
The reaction is:3 CuSO4 + 2 K3PO4 = Cu3(PO4)2 + 3 K2SO4The balanced molecular equation for copper(II) sulfate and potassium phosphate is:3CuSO4(aq) + 2K3PO4(aq) --> Cu3(PO4)2(s) + 3K2SO4(aq)This is a double replacement reaction, also called a double displacement reaction or a metathesis reaction. In this type of reaction, the positive and negative ions in the reactants switch places to form the products. The products must include a solid (precipitate), an insoluble gas that bubbles out of solution, or water. If none of those are present in the products, then their was no reaction. The general equation for a double replacement reaction is AB + CD --> AD + CB, in which A and C are the positive ions, and the B and D are the negative ions.
single-replacement reactions and a double-replacement reactions differ in the fact that in a single-replacement reaction only one element that has a positive charge is oxidized or looses electrons. In double-replacement reactions two elements in a compound that contain a positive charge are oxidized.
Single replacement
The general equation is:AB + CD = AD + CB
Double replacement reaction
Most normally this 2X --> X2 reaction is exothermicbut it is not a general rule.
A chemical equation is the representation of a chemical reaction.
General format= AC + CD -> AD + CB
General format= AC + CD -> AD + CB
.Ab + c cb + a
.Ab + c cb + a
A double replacement reaction.
Ab+c->ac+b
A general equation doesn't exist; this depends on type of the chemical reaction involved.
acid + base → salt + water