Problem: Describe how you would prepare each of the following aqueous solutions, starting with solid KBr.a 0.160 M solution of KBr that contains just enough KBr to precipitate 17.0 g of AgBr from a solution containing 0.480 mol of AgNO3

FREE Expert Solution

KBr reacts with AgNO3 in a double displacement reaction to produce AgBr and KNO3. In this reaction Ag+ from AgNO3 will react with Br- from KBr to produce AgBr, which precipitates from the solution.

Recall that silver halides are insoluble.


<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>KBr</mi><mfenced><mi>aq</mi></mfenced></msub><mo>+</mo><msub><mi>AgNO</mi><mrow><mn>3</mn><mfenced><mi>aq</mi></mfenced></mrow></msub><mo>&#x2192;</mo><msub><mi>AgBr</mi><mfenced><mi mathvariant="normal">s</mi></mfenced></msub><mo>+</mo><msub><mi>KNO</mi><mrow><mn>3</mn><mfenced><mi>aq</mi></mfenced></mrow></msub></math>


We will solve this problem through these steps:

  • Find mass of KBr through
    • Converting mass of AgBr to moles
    • Find moles of KBr from moles of AgBr using the mole ratio as in the above equation
    • Find mass of KBr
  • Find the volume of 0.160 M KBr solution that contains the mass of KBr just calculated


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Problem Details

Describe how you would prepare each of the following aqueous solutions, starting with solid KBr.

a 0.160 M solution of KBr that contains just enough KBr to precipitate 17.0 g of AgBr from a solution containing 0.480 mol of AgNO3

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