Question #1 a,b,c,d fame Questions on Section 1. What happens to the experimenta
ID: 1084382 • Letter: Q
Question
Question #1 a,b,c,d
fame Questions on Section 1. What happens to the experimental value of the density of the salt solution as a result of the following errors (will the value found be too high, too low or unchanged?) EXPLAIN YOUR ANSWERS! (a) Forgetting to rinse the pipet with the unknown solution after it has been rinsed with distilled water. (b) Failure to tip the hanging drop from the pipet into the Erlenmeyer flask containing the unknown solution. (c) Blowing the last bit of liquid from the pipet into the Erlenmeyer flask containing the unknown solution (d) Failure to notice that the balance is set at 0.050 g instead of 0.000 g before the empty flask is put on the pan. When the flask plus sample are weighed, the balance is set at 0.000 g? 2. Why is it necessary to weigh the Erlenmeyer flask just before each sample is pipetted into the flask instead of just at the beginning of the first trial?Explanation / Answer
1) a) As there will be some distilled water in the pipet therefore it will dilute the solution and more volume of unknown will be needed leading to too higher density of the salt.
b) As there will be some unknown solution hanging at the tip the pipet therefore it will be countedin the added the solution but not used for titration and more volume of unknown will be needed leading to too higher density of the salt.
c) As there will be some unknown solution in the pipet blown in the flask and therefore more volume of unknown will be needed leading to too higher density of the salt.
d) This will lead to less mass calculated for the salt and thus will lead too low density of the salt.