Acids & Bases, Electrochemical Cells Flashcards
How does the body ensure the concentration of the weak acid in blood doesn’t get too high?
- The carbonic acid is broken down, forming CO, which is exhaled via the lungs.
Why is a Burette preferred over a measuring cylinder when doing titrations
A burette is more precise
What is the difference between a Strong Base and a Weak Base?
The difference between a Strong Base and a Weak Base is their concentration of hydroxide ions (OH-) in water. Strong Bases have a high concentration of OH- ions and Weak Bases have a low concentration.
What is the difference between a Strong Base and a Weak Base?
The difference between a Strong Base and a Weak Base is their concentration of hydroxide ions (OH-) in water. Strong Bases have a high concentration of OH- ions and Weak Bases have a low concentration.
State why an indicator may not be required for a titration
the reactants are self-indicating
Would the pH of solution containing Mg(OH)2 have a differing pH to Ca(OH)2 and why?
Smaller/Lower pH because magnesium is less/sparingly soluble.
why is the pH probe washed with distilled water between each of the calibration measurements
to prevent contamination
Why is the volume added of a selected acid or base reduced between each pH measurement during and experiment?
To avoid missing the end point
What is a half-cell?
A half cell is one half of an electrochemical cell. They are constructed of a metal dipped in its ions, or a platinum electrode with two aqueous ions.
How do we make half cells with ions with no solid counterpart, or with two or more ions?
If there is a half cell with 2 aqueous ions we must use an inert but electrically conductive electrode e.g Platinum
What does an electrode potential show?
electrode potentials (V) show how easily the half cell gives up electrons (oxidation)
