Question

1.) Why must the solution used to wash the precipitate be slightly acidified?

2.) If a student did not test the precipitate for presence of copper and some was included with the AgCl, will the final result (Ag %) be higher or lower than the true value? Why?

3.) If the precipitate was not dried completely before final weighing, will the final result (Ag %) be higher or lower than the true value? Why?

4.)Assuming the final concentration of chloride anion after the addition of HCl (precipitation step) was 0.1M, what is the remaining concentration of Ag+ in the solution? (pKsp for AgCl = 9.74)

5.)What is aqua regia? How is it different in composition from aqua fortis? Why might it be used instead of aqua fortis?

Answer 1