Bath Salts ingredients
What mass of NaCl is required to lower the melting point of 5.5 kg of ice to -5.0 º C?
In the manufacture of ice cream, The product temperature is maintained below 0 º C using a bath of ice and salt. Assuming that the NaCl dissolves completely and forms an ideal solution, what mass of NaCl is required to lower the melting point of 5.5 kg of ice to -5.0 º C? [Kf (H2O) = 1.86 º C / m]
NaCl is an electrolyte Strength: NaCl = Na + + Cl-for which i = 2 = factor Vant'Hoff delta T = kf ixmx 5.0 = 1.86 m 2 = Xmx = 1.3 moles of solute / mass of water = moles NaCl / 5 5 = 1.3 5.5 x 7.15 mol NaCl = mass of NaCl = 7.15 mol x 58.44 g / mol = 417.9 g
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