A sample consists of one or two of the following salts: CH,CO,Na (sodium acetate

Question

A sample consists of one or two of the following salts: CH,CO,Na (sodium acetate), KCl, Hga(NO). The sample completely dissolves in water but when aqueous potassium iodide is added a precipitate is formed. You may need to use additional resoures ike your texct book) to answer these questions 5. Look at the solubility rules, are all of the salts soluble? Write out the equations of the dissolution of each salt. If any of the ions produced from the dissolution of each salt were mixed together would an insoluble precipitate form? If yes, list the salt that would form and why it would not be soluble and list the two original salts that must not both be present. Which of the salts, CH,CO,Na, KCl, or Hg.(NO) would form an insoluble precipitate when KI is added? Write out a balanced net-ionic equation. a· b. c. d. e. What salt, CH,CO,Na, KCl, or Hg.(NO), must be absent and why? f. What salt, CH,CO,Na, KCl, or Hg.(NO), must be present and why? g. What salt, CH,CO,Na, KCl, or Hg.(NO, is unknown if it is present or absent based on the information given?

Explanation / Answer

a)

yes, they are all soluble

since acetate, potassium and nitates are soluble

b)

CH3CO2Na = CH3CO2- + Na+

KCl = K+ + Cl-

Hg2(NO3)2 = Hg2+2 2NO3-

c)

when mixed together,

Hg2+2 + 2Cl- = Hg2Cl2 will form

d)

if we add KI --> Hg2+2 + 2I- = Hg2I2 forms

only

e)

KCl should not be present, since it has not formed preciptiate with Hg2+2 ions to form Hg2Cl2

f)

for sure, Hg2(NO3)2 is present, since it will form precipitate

g)

not possible to predict is CH3CO2Na, since it will not form any kind of reaction with previous steps

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