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Chapter 6.2

Chapter 6.2. Rate of Dissolving. The rate of dissolving is the measure of how fast a solute dissolves in a solvent. What factors would affect rate of dissolving (R.O.D.)? Agitation (stirring or shaking) Particle Size of Solute Temperature . Rate of Dissolving. REMEMBER :

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Chapter 6.2

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  1. Chapter 6.2 Rate of Dissolving

  2. The rate of dissolving is the measure of how fast a solute dissolves in a solvent. • What factors would affect rate of dissolving (R.O.D.)? • Agitation (stirring or shaking) • Particle Size of Solute • Temperature Rate of Dissolving

  3. REMEMBER: • Sugar dissolves when placed in water. • According to the particle theory water particles are attracted to the sugar and this is why it dissolves. • Particles are always moving so eventually the dissolved sugar will move away from the solid sugar crystal to allow more water to attract the sugar particles that are left. • It takes time for the recently paired up sugar/water to move away and allow a free water particle to attract another sugar particle. 

  4. THEREFORE: • When the mixture is agitated (stirred, mixed, shaken) 3 things help increase the r.o.d: • The concentrated solution is moved/pushed away from the crystal quickly • Fresh water is moved toward the crystal • The solute crystal can be totally surrounded by solvent

  5. Particle Size of Solute • smaller particle = faster rate of dissolving • Temperature • higher temperature = faster R.O.D. • Example: When we dropped the tea bag into the glass of hot water we could see the tea start to dissolve immediately where as when we put a tea bag into room temperature water it took longer to dissolve

  6. Rate of Dissolving (R.O.D)According to The Particle Theory of Matter (PTM)

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