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NTA Abhyas NEET2020ChemistryIonic EquilibriumPractice

Solid B a ( N O 3 ) 2 is gradually dissolved in a 1.0 × 1 0 - 4 M N a 2 C O 3 solution. At what concentration of B a 2 + will a precipitate begin to form? K s p f o r B a C O 3 = 5.1 × 1 0 - 9

Options

  1. A5.1 × 1 0 - 5 M
  2. B8.1 × 1 0 - 8 M
  3. C8.1 × 1 0 - 7 M
  4. D4.1 × 1 0 - 5 M

Correct answer

A. 5.1 × 1 0 - 5 M

Step-by-step solution

Ba NO 3 2 + Na 2 CO 3 → BaCO 3 + 2 NaNO 3 Here C O 3 - 2 = N a 2 C O 3 = 1 0 - 4 M K s p = B a + 2 C O 3 - 2 = 5.1 × 1 0 - 9 B a 2 + 1 0 - 4 = 5.1 × 1 0 - 9 B a 2 + = 5.1 × 1 0 - 5 M At this value of B a 2 + = 5.1 × 1 0 - 5 M precipitation just starts.

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