Hey everyone. Sorry for the lateness of this post.

This week we will continue on the topic of solutions. I am attaching word problems and a solubility data table for you to use. This table is used to determine whether of not a compound will dissolve in water.

Explanation on how to use the solubility data table:

Anions are negative ions. The top row of this chart indicates possible anions in solution (eg. Cl^-, S^2-, CO₃^2-, etc...) 

Below the word anion, you will see "high solubility (aq)", then low solubility (s). High solubility means it will dissolve easily in water. (aq) means it's dissolved in water (aqueous). Low solubility means it doesn't dissolve well in water. (s) means it remains a solid in water.

Cations are positively charged ions. If you go across the chart in the same line with high solubility or low solubility, you will see some the cations that when mixed with the anions on top of them in the chart, will either dissolve well in water or not.

Example 1: Take Na₂S. To determine if we write (aq) or (s) after it, we look at the chart. Na₂S contains Na⁺ and S^2-. You find the negative charge first, the S^2-. Look underneath it and find the positive ion. Na is in group 1 on the periodic table. So Na with S is highly soluble. After the compound, you would write Na₂S_(aq).

Example 2: Take Ag₂SO_4. Again, find the anion first. Then look under it to see where the cation fits in. According to the chart, silver with sulfate has low solubility. It will not dissolve well in water, so we write Ag₂SO_4(s).

Example 3: When you look at Cl^-, Br^-, I^-, these 3 anions combined with most cations have high solubility in water (aq), except the ones on the bottom (s) Ag⁺, Pb²⁺, Tl⁺, etc... So AgCl_(s) but NaCl_(aq).

For a flame test or solution colour test, just look at teh chart to see what colour the flame would be and what colout the substance would be in solution. This is a tool to help identify what is inside a solution.

A Dissociation Reaction identifies what happens to a compund when it is placed in water. it shows whether or not the compund "dissociates" into its anion and cation. See last week's power point notes for examples.