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SS2: CHEMISTRY - 2ND TERM

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  1. Water & Solution I | Week 1
    10 Topics
    |
    1 Quiz
  2. Water, Solution and Solubility | Week 2 & 3
    9 Topics
    |
    1 Quiz
  3. Air | Week 4
    4 Topics
    |
    1 Quiz
  4. Pollution | Week 5
    6 Topics
    |
    1 Quiz
  5. Rate of Chemical Reaction | Week 6 & 7
    6 Topics
    |
    1 Quiz
  6. Energy and Energy Effect I | Week 8 & 9
    7 Topics
    |
    1 Quiz
  7. Energy and Energy Effect II | Week 10 & 11
    6 Topics
    |
    1 Quiz
  8. Chemical Equilibrium | Week 12
    8 Topics
    |
    1 Quiz

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Topic Content:

  • Calculations on Solubility

Example 2.5.1:

30 cm3 of a saturated solution of a salt NaX was dissolved in water at 25°C, was evaporated to dryness and only 2.5 g of solid was left. Calculate the solubility of the salt in water at 25°C in moles/dm3 (Na = 23, X = 19)

Solution

30 cm3 of saturated solution contains 2.5 g 

1000 cm3 of the solution will contain

\( \frac{1000\:cm^3}{30\:cm^3} \: \times \: \frac{2.5g}{1} \\ \normalsize = \scriptsize 83.3\: g/dm^3 \)

Solubility in mol/dm3 = \( \frac{Solubility\: in \: g/dm^3}{Molar\:Mass} \)

Molar mass of NaX = 23 + 19 = 42 g/mol 

 

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