If the stockroom fails to dry the KHP to remove the waters of hydration, the student's calculated concentration
for the standardized base will be
(low, high, or unaffected)
A drop of NaOH is hanging from the buret tip before the titration of KHP. Once the student begins the titration that drop falls into the KHP solution. The calculated concentration for the standardized base wil be
(low, high, or unaffected)
mols KHP = grams/molar mass
M base = mols KHP/L base.
If the KHP is wet, the mass of the KHP weighed will be too low (because some of the mass is water). of grams is too low in equation 1, then mols is too low. If mols is too low in equation 2, then M base is too low.
Assuming the buret reading is 0.00 at the beginning AND there is a drop of NaOH hanging on the tip of the buret, then the buret reading will be too low when the end point is reached. L base too low in equation 2 will give high results for molarity of NaOH.
low
If the stockroom fails to dry the KHP to remove the waters of hydration, the student's calculated concentration for the standardized base will be unaffected.
However, if a drop of NaOH is hanging from the buret tip before the titration of KHP and that drop falls into the KHP solution, the calculated concentration for the standardized base will be high.
If the stockroom fails to dry the KHP to remove the waters of hydration, it means that the KHP sample will still contain water molecules bonded to the compound. This will affect the accuracy of the calculated concentration for the standardized base during the titration.
When KHP contains water molecules, its actual weight will be higher than its anhydrous weight. This will lead to an overestimate of the concentration of the standardized base. Therefore, the calculated concentration for the standardized base will be high.
On the other hand, if a drop of NaOH falls into the KHP solution before the titration begins, it will introduce additional base into the solution. This extra base will react with the KHP during the titration, resulting in a higher consumption of the base. Consequently, the calculated concentration for the standardized base will be low.
To summarize:
- If the KHP is not properly dried, the calculated concentration for the standardized base will be high.
- If a drop of NaOH falls into the KHP solution before the titration, the calculated concentration for the standardized base will be low.
It's important to note that these scenarios assume the ideal situation where no other errors or factors affecting the titration occur.