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Asked by rbhatt16 31st July 2018, 8:59 PM
Answered by Expert
Answer:
Given:
Vapour pressure= 31.8 mm
Vapour pressure of pure water =31.9 mm
 
Find: 
Ksp= ?
 
Formula colon

fraction numerator straight P to the power of 0 minus straight P subscript straight s over denominator straight P subscript straight s end fraction space equals straight n over straight N space
Where space straight P to the power of 0 space is space vapour space pressure space of space pure space water
straight P subscript straight s space space is space vapour space pressure space of space solution
straight n space represents space nuber space of space moles space of space solute
straight N space is space number space of space moles space of space the space solvent

Solution colon space
Substitute space the space values space in space the space above space expression comma
fraction numerator 31.9 minus 31.8 over denominator 31.8 end fraction space equals fraction numerator straight n over denominator 55.56 end fraction space

straight n equals 0.175

One space molecule space of space straight A subscript 2 straight B subscript 2 space dissociates space to space give space 4 space particles.
Hence comma space the space solubility space of space is space fraction numerator 0.175 over denominator 4 end fraction space equals space 4.3 space cross times 10 to the power of negative 2 end exponent
Answered by Expert 1st August 2018, 11:50 AM
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