Which of the following mixtures contain the least number of ions in solution?
A) 1 mol Ba(NO3)2 + 1 mol NaCl
B) 1 mol Ba(NO3)2 + 1 mol Na2SO4
C) 1 mol Ca(NO3)2 + 1 mol NaCl
D) 1 mol NH4NO3 + 1 mol Na2SO4
Answer: B
Concept: When a precipitate (insoluble salt) is formed, the ions are removed from solution.
To determine the no. of ions in solution, we need to first determine the no. of ions produced for 1 mole of each salt
e.g. Ba(NO3)2 → Ba3+2+ + 2NO3– (i.e 3 moles of ions)
No comments:
Post a Comment