Conservations in Solutions
Charge conservation
Sign: no molecule, only ions
NCEE
Procedure 1
If \( c(A^+) + c(B^+) = c(C^-) + c(D^-) \)
\( c(A^+) > c(B^-) > c(C^+) > c(D^-) \) and \( c(A^+) > c(C^+) > c(B^-) > c(D^-) \) are false
In other word, The first and last ion must be both positive or both negative.
NCEE
Conservation of Matter
Sign: has ions and molecules; no \( H^+ \) \( OH^- \)
Conservation of protons
Sign: has ions and molecules and \( H^+ \) and \( OH^- \)
Extra: Concentration comparison
Major forms > Primary hydrolysis products and Primary ionization products > others
\( MA : HA = 1 : 1 \)
Either \( c(HA) > c(M+) > c(A^-) \) or \( c(A^-) > c(M+) > c(HA) \) is true