post-lab questions hat are two possible sources of error in the experiment? explain 2. when an acid reacts completely with a base the process is often called neutralization. if the product mixture is_1
Two common sources of error in an acid–base neutralization or titration experiment are:
- Inaccurate volume measurement
- If the burette, pipette, or graduated cylinder is read incorrectly (for example, due to parallax error or misjudging the meniscus), the recorded volume of acid or base will be wrong.
* This directly affects the calculated concentration or moles of reactant, leading to an incorrect equivalence‑point determination.
- Incorrect or inconsistent endpoint detection
- The endpoint is usually signaled by a color change of an indicator (like phenolphthalein). If the indicator is added in the wrong amount or the color change is misjudged (too early or too late), the titration will overshoot or undershoot the true equivalence point.
* Human perception differences and poor mixing can also make the color change appear gradual, increasing the chance of error.
About neutralization and the product mixture
When an acid reacts completely with a base, the process is called neutralization , and the products are water and a salt.
- If the product mixture is neutral , the pH at the equivalence point is approximately 7 , which typically happens when a strong acid reacts with a strong base (e.g., HCl + NaOH).
- If the mixture is not neutral (pH ≠ 7), it is usually because either the acid or the base is weak , so the salt formed hydrolyzes and shifts the pH away from 7.