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Sodium Carbonate cannot be used in place of ( NH ₄ )₂ CO ₃ for the identification of Ca ²⁺, Ba ²⁺ and Sr ²⁺ ions (in group V ) during mixture analysis because :

Options

  1. AMg ²⁺ ions will also be precipitated.
  2. BConcentration of CO ₃ ²⁻ ions is very low.
  3. CSodium ions will react with acid radicals.
  4. DNa ⁺ ions will interfere with the detection of Ca ²⁺, Ba ²⁺, Sr ²⁺ ions.

Correct answer

A. Mg ²⁺ ions will also be precipitated.

Step-by-step solution

If Na ₂ CO ₃ is used in place of ( NH ₄ )₂ CO ₃ . It will precipitate group V radicals as well as magnesium radicals. The reason for this is the high ionization of Na ₂ CO ₃ in water into Na ⁺ and CO ₃⁻⁻ . Now the higher concentration of CO ₃⁻⁻ is available which exceeds the solubility product of group V radicals as well as that of magnesium radicals.

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