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How do the Ka values for weak and strong acids compare?
The greater the ##K_a## value for an acid is relative to the strength of the acid, or the magnitude at which it will disassociate in water.
The closer the ##K_a## value is to one the stronger it is (the term "strong acid" means that it completely disassociates).
If you can remember the 6 strong acids you'll know that all other acids are weak: ##HCl## ##HBr## ##HI## ##H_2SO_4## ##HClO_4## ##HNO_3##