PRE-LAB QUESTIONS I. What does the expression, \"digesting a precipitate\" mean?

Question

PRE-LAB QUESTIONS I. What does the expression, "digesting a precipitate" mean? 2. Describe how to test the filtrate for the presence of excess K.Fe(CN)c3H,O 3. Wha e t mass of potassium ferrocyanide trihydrate was in the original mixture in the exa Help Sheet? (Answer l) 4. What was the mass of cobalt(ID) chloride hexahydrate in the original mixture in the ext 5. What are the percentages of the two components in the original salt mixture in the exa 6. What mass of cobalt(II) chloride hexahydrate was used in the reaction in the example 7. What mass of cobalt(II) chloride hexahydrate was left over after the reaction in the ex 8. If some of the K,CoFe(CN) HO is lost in the filtering process, would your reported Help Sheet? (Answer 2) Help Sheet? (Answers 3 and 4) Sheet? Help Sheet? higher or lower than the actual amount in the salt mixture? Explain.

Explanation / Answer

1) Digesting a precipitate is the process of growing larger particles or nuclei or crystallites of the precipitate by heating the precipitate and mother solution(from which it precipitated) for sometime.Due to digestion cleaner and larger particles for the precipitate can be obtained.This process of digestion is called Ostwald ripening .

2)K4[Fe(CN)6 ] has iron in +2 oxidation state shown as:

[Fe(2+)(CN)6]^4- ,if a solution of K3[Fe(CN)6] with Fe3+ is added they form deep blue precipitate of K[FeFe(CN)6]

with both Fe2+ and Fe3+ as [Fe(2+)Fe(3+)(CN)6]^-. This test can be used for identifying potassium ferrocyanideK4[Fe(CN)6 ] by adding potassium ferrocyanide to it,K3[Fe(CN)6] .

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