Arrange the following 0.10 M solutions in order of increasing H+ : HClO4 , H2SO4, NH4Br , KCN, KBr, KOH
If you want to make sure you are correct I would calculate the pH of 0.1M solutions of each, then you will know how to arrange them.
I would look at the following:
H2SO4
HClO4
NH4Br
KBr
KCN
KOH
KOH
To arrange the solutions in order of increasing H+, we need to compare the strength of their corresponding acids or bases. Here's how you can do it step by step:
1. Identify the acid or base present in each solution:
- HClO4: This is a strong acid called perchloric acid.
- H2SO4: This is another strong acid called sulfuric acid.
- NH4Br: This is a salt, so it does not directly contribute to H+. However, NH4Br can undergo hydrolysis to produce a weak acid, NH4+.
- KCN: This is a salt as well, and it can also undergo hydrolysis; however, it produces a weak base, CN-.
- KBr: This is a salt and does not directly contribute to H+ or OH-.
- KOH: This is a strong base called potassium hydroxide.
2. Determine the strength of the acids and bases:
- Strong acids dissociate completely in water, so both HClO4 and H2SO4 will release all their protons (H+) into the solution.
- Weak acids, like NH4+, only partially dissociate, releasing a limited amount of H+ into the solution.
- Weak bases, like CN-, can accept H+ ions, but in a limited capacity.
- Strong bases, like KOH, will dissociate completely, releasing OH- ions into the solution and consuming any available H+ ions.
3. Compare the strengths of the acids:
- HClO4 and H2SO4 are both strong acids, so they will have the highest H+ concentration.
- NH4Br is a weak acid, so it will have a lower H+ concentration compared to the strong acids.
- KCN does not provide a direct source of H+ but can react with water, producing a weak base, CN-. Therefore, it will have a lower H+ concentration.
- KBr does not contribute to H+, so it will have the lowest H+ concentration.
- KOH is a strong base and will consume H+ ions, resulting in the lowest H+ concentration.
Therefore, the solutions arranged in increasing H+ concentration would be: KBr, KCN, NH4Br, KOH, HClO4, H2SO4.