Questions 1 and 2 Questions Specify whether the calculated mass percent of water

Question

Questions 1 and 2 Questions Specify whether the calculated mass percent of water would be too high, too low, or unchanged as a result of each of the following experimental conditions. Justify your answers. b. The healing was insufficient to remove all of the water from the hydrated salt. c. Some of the sample spattered out of the crucible onto the laboratory bench during the heating 2. Briefly explain the reasons for the use of the following techniques in this experiment. a. The hydrate salt is heated with the crucible cover in an ajar position rather than in a fully seated position or having the crucible completely uncovered b. The crucible cover is fully seated during cooling and weighing of the residue

Explanation / Answer

1 a) The calculated mass percent of water if its not removed properly then the weight of the denominator increases in the following fomula. Therefore, % by mass would be reduced

% by mass from the water

=[ Mass of water (Mass of hydrated salt-Mass of anhydrous salt) / Mass of hydrated salt]*100

b) If some of the sample spattered out from the crucible. The weight of denominator in the formula given above will be reduced, hence % by mass will be increased.

2) a) Because some salt may be damaged if place is completely seated position.

b) To avoid the affect of atmosphere.

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