4 and 7 s l IHethanól in today\'s experiment? (2 points) To rinse the soiet in t

Question

4 and 7

s l IHethanól in today's experiment? (2 points) To rinse the soiet in the end 4) Why do you need to heat the solution during gravimetric determination? (2 points) et the gecurate ass of te solie n thee end to spead draing 5) Which of the following is not an attribute of qualitative research? (1 point) a) Answers the question, why?b es numbers and data c) deals with smaller, more focused data d) Includes observational study 6) Observing gorillas for months in their natural habitat is an example of. (1 point) aQualitative research b) a controlled experiment c) Quantitative research d) None of he above 7) As sulfuric acid (H2SO4) is added to the barium hydroxide (Ba(OH)2) solution, a white poins it woill Vaue a Sudden change because there uit be a vead io at precipitate forms. What would happen to the conductivity as precipitate forms? Why? (2 points)

Explanation / Answer

4) heat the solution on a hot plate to increase the particle size for easier filtering . This is usually referred to as digestion. So due to increasing particle size which facilitate the filtering and get accurate mass of precipitate.

7) H2SO4 is strong acid and Ba(OH)2 is strong base.

when H2SO4 is added to Ba(OH)2, then reaction is

H2SO4 (aq) + Ba(OH)2 (aq)..................> BaSO4 (s) + 2 H2O (l)

so here BaSO4 precipitated.

Dut to small solubility of BaSO4, the number of ions in solution decreases.

We know, ions carry current.

so conductivity of the solution decreases.

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