Solution Stoichiometry 1. If some of the measured unknown acid is spilled when t

Question

Solution Stoichiometry

1. If some of the measured unknown acid is spilled when transferring it to the reaction flask before the titration, how will that impact the resultant molar mass value? (low, high, now change) explain.

2. if a student adds an additional 20 ml of water to the reaction flask during the titration, how does that impact the final results? (low, high, no change) explain.

3. Imagine that you overran the endpoint in a Part 2 titration by 3 drops (20 drops = 1.00ml). How would this affect the resultant molar mass value for this trial? would this trial be considered a reliable trial (agreement within 3% of the other molar mass values)?

4. How is it that titration results can agree within 3% of each other? What is it about the technique of titration that allows for such high precision or reproducibility?

Explanation / Answer

Ans 1 :

If the unknown acid is spilled while transferring into the flask , which means the amount of acid in the flask is less than assumed. So now less amount of base will be required to titrate it .

Now using the equation M1V1 = M2V2 , where M refers to molarity and V stands for volume of the solutions, the molar of the unknown acid as determined from the titration experiment will be high.

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