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24 March, 01:56

A 5ml saturated sample of borax was collected at 49.2 degrees C. it required 18.23ml of 0.2222 M HCl to titrate. calculate the Ksp for this sample

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  1. 24 March, 02:26
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    Given:

    Volume of sample = 5 mL Borax (Sodium tetraborate)

    Temperature = 49.5 degrees C

    Volume of titrant = 18.23 mL

    Concentration of Titrant = 0.2222 M HCl

    First, set-up a balanced equation:

    Na2B4O7*10H2O (borax) + 2 HCl = 2 NaCl + 4 H3BO3 + 5 H2O

    Calculate the concentrations of HCl, NaCl, and H3BO3, then solve for the Ksp or Solubility Product Constant:

    Ksp = ([NaCl]^2 * [H3BO3]^4) / [HCl]^2
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