We’re asked to predict which ion: Al3+ or Ga3 produces the more acidic aqueous solution.
Recall that when comparing the acidity of cations in solution:
Since both cations have the same charge, we will compare their ionic radius using periodic trends to determine the smaller cation which produces a more acidic solution.
Recall that ionic radius is the size of an ion. The trend for ionic radius or size is as follows: it increases from right to left and down a period in the periodic table:
Predict which member of each pair produces the more acidic aqueous solution?
Al3 + or Ga3 + .
Frequently Asked Questions
What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Identifying Acids and Bases concept. You can view video lessons to learn Identifying Acids and Bases. Or if you need more Identifying Acids and Bases practice, you can also practice Identifying Acids and Bases practice problems.