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The 25°C evaporation of a 100 cm\(^{3}\) solution of K\(_{2}\)CO\(_{3}\) to dryness gave 14g of...

Chemistry
WAEC 2021

The 25°C evaporation of a 100 cm\(^{3}\) solution of K\(_{2}\)CO\(_{3}\) to dryness gave 14g of the salt. What is the solubility of K\(_{2}\)CO\(_{3}\) at 25°C? [K\(_{2}\)CO\(_{3}\) = 138]

  • A. 0.01 mol dm\(^{-3}\)
  • B. 0.101 mol dm\(^{-3}\)
  • C. 1.01 mol dm \(^{-3}\)
  • D. 10.0 mol dm\(^{-3}\)
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Correct Answer: Option C
Explanation

solubility( in mol/dm^3) = \(\frac{ mass  of salt}{ Molar Mass of salt} = \frac{ 1000cm^3}{ volume of solution in cm^3}\)

                                         \(\frac{14}{138 } = \frac{ 1000cm^3}{ 100}\)

                                           \(\frac{14000}{13800}  = 1.01 mol/dm^3\)


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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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