A solution is made with 0.20 mol/L of formic acid, HCOOH…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A solution is made with of formic acid, HCOOH. Of its molecules, ionise. Find the concentrations of , of and of whole HCOOH molecules at equilibrium.
Need a reminder? The key ideaShow
Arrhenius: acids give and bases give in water. Bronsted-Lowry: acids donate protons and bases accept them; a conjugate pair differs by one proton. Lewis: acids accept an electron pair, bases donate one. Strong electrolytes ionise fully, weak ones partly. If a fraction of mol/L of acid ionises, .
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Ions. .
Step 2. Whole molecules. .
Answer: of each ion; of HCOOH. Most of the acid stays whole, as for any weak acid.
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