Here is a list of 0.300 M solutions that you can consider to select which has the highest concetration of potassium ions:
Select one:
a. potassium oxide
b. potassium phosphate
c. potassium hydrogen carbonate
d. potassium hypochlorite
e. potassium iodide
Answer:
Explanation:
First, you must write the chemical formula of each one of the potasssium compounds. Then, assume all the compounds ionize 100%.
Since all the solutions have the same concentrations, by assuming 100% ionization, the ionization equations will show which one produces the highest number of potassium ions, K⁺¹, and that is the solution with the highest concentration of such ions.
1. Chemical formulae
Compound Formula
a. potassium oxide K₂O
b. potassium phosphate K₃PO₄
c. potassium hydrogen carbonate KHPO₃
d. potassium hypochlorite KClO₄
e. potassium iodide KI
2. Dissociation (ionization):
K₂O does not dissociate but react with water to product KOH, then KOH dissociates, but there is not such thing as a 0.300 M solution of K₂O.
K₃PO₄ → 3K³⁺ + PO₄¹⁻ 3 K⁺¹ ions per unit formula
KHPO₃ → K⁺¹ + HPO₃⁻¹ 1 K⁺¹ ion per unit formula
KClO₄ → K⁺¹ + HClO₄⁻¹ 1 K⁺¹ ion per unit formula
KI → K⁺¹ + I⁻¹ 1 K⁺¹ ion per unit formula.
Hence, the 0.300 M solution of potasssium phosphate produces the highest concentration of potassium ions.
